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Применить Всего найдено 15. Отображено 13.
10-07-2014 дата публикации

Efficient Angle Rotator Configured for Dynamic Adjustment

Номер: US20140195579A1
Автор: Alan N. WILLSON, JR.
Принадлежит: Pentomics Inc

An apparatus and method for angle rotation is disclosed to rotate a complex input by the angle θ to produce a rotated complex output signal. A memory storage device generates control information based on a coarse angle θ M . A coarse rotation butterfly circuit uses the control information to rotate the complex input signal by the coarse angle θ M to produce an intermediate complex number. The control information controls one or more multiplexers and/or adders in the coarse rotation butterfly circuit to rotate the complex input signal. The fine rotation butterfly circuit uses the control information to rotate the intermediate complex number by a fine angle θ L to produce the complex output signal. The control information controls one or more multiplexers and/or adders in the fine rotation butterfly circuit to rotate the intermediate complex number.

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Номер записи: 1
09-06-2016 дата публикации

Excess-Fours Processing in Direct Digital Synthesizer Implementations

Номер: US20160161975A1
Автор: HU Tianyu, JR. Alan N., LIU Yunfan, WILLSON
Принадлежит:

Systems and methods for a split phase accumulator having a plurality of sub phase accumulators are provided. Each sub phase accumulator receives a portion of a frequency control word. The first sub phase accumulator includes a first register and the remaining sub phase accumulators include a register and an overflow register. At each discrete point in time, the first sub phase accumulator is configured to be responsive to the first portion of the frequency control word at that discrete point in time and to the first sub phase accumulator value at the immediately previous discrete point in time, and each of the remaining sub phase accumulators is configured to he responsive to a value of its corresponding portion of the frequency control word at that discrete point in time and to the same second sub phase accumulator value at the immediately previous discrete point in time. 1. A system comprising: a first accumulator including a first register, the first accumulator configured to receive a first portion of the frequency control word, and', 'a second accumulator configured to receive a second portion of the frequency control word, wherein the second accumulator includes a second register and an overflow register,', 'wherein the phase accumulator is configured to produce a sequence of normalized rotation angles, each normalized rotation angle being based on a current value of the first accumulator and a current value of the second accumulator, including its overflow register, and', 'wherein the first accumulator and the second accumulator operate simultaneously in a first output data cycle; and, 'a phase accumulator configured to receive a frequency control word as an input, the phase accumulator comprisinga fine rotation stage, coupled to the phase accumulator, wherein the overflow register delays a carry-in to the first accumulator until a second output data cycle and wherein the fine rotation stage is responsive to the carry-in during the second output data cycle.2. ...

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Номер записи: 2
20-08-2015 дата публикации

Optimal Factoring of FIR Filters

Номер: US20150236669A1
Автор: JR. Alan N., Mehrnia Alireza, WILLSON
Принадлежит:

A method and system for the design and implementation of an optimally factored filter is presented. Pairs of angle values are organized in pairing candidates and a threshold is defined to indicate an upper bound on the number of pairing candidates. A first pairing candidate is exchanged above the threshold with a second pairing candidate below the threshold and a matrix is generated based on the pairing candidates below the threshold. A lowest predicted total quantization cost between all pairing candidates represented within the matrix is determined and the pairing candidates that result in the lowest predicted total quantization cost are used to determine the coefficients of the filter. 1. A filter , implemented in hardware , configured to receive an input signal and generate an output signal , the filter comprising:a plurality of first stages, each stage of the plurality of first stages having an order of four or greater; andone or more second stages, each stage of the one or more second stages having an order less than four,wherein the one or more second stages and the plurality of first stages are coupled together in cascade and wherein a total order of the plurality of first stages is higher than a total order of the one or more second stages.2. The filter of claim 1 , wherein each stage of the plurality of first stages includes at least two multipliers.3. The filter of claim 1 , further comprising a multiplier positioned at the end of a last stage in the cascade.4. The filter of claim 1 , further comprising a scaling multiplier disposed between a pair of stages in the cascade.5. The filter of claim 4 , wherein the scaling multiplier is configured to multiply a signal received at the scaling multiplier by a power of two.6. The filter of claim 5 , wherein the scaling multiplier is further configured to shift a number of bits associated with an output of a previous stage to the right if the power of two is less than 1 claim 5 , and to shift the number of bits ...

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Номер записи: 3
10-09-2015 дата публикации

Optimally Factored Interpolated FIR Filter Design

Номер: US20150256150A1
Автор: Alan N. Willson, Jr., Alireza Mehrnia
Принадлежит: Pentomics Inc

A method and system for the design and implementation of an optimally factored interpolated finite impulse response (IFIR) filter is presented. Techniques used to increase the implementation efficiency of the filter include joint sequencing of the filter stages, use of an nested IFIR filter, taming of a stage by relocation of that stage, fusing two or more stages together to form a single stage, and manual manipulation of a post-stage multiplier. IFIR filters using this approach may be realized as low pass filters or high pass filters, and in either analog or digital form.

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Номер записи: 4
03-11-2016 дата публикации

Optimal Factoring of FIR Filters

Номер: US20160322958A1
Автор: JR. Alan N., Mehrnia Alireza, WILLSON
Принадлежит:

A method and system for the design and implementation of an optimally factored filter is presented. Pairs of angle values are organized in pairing candidates and a threshold is defined to indicate an upper bound on the number of pairing candidates. A first pairing candidate is exchanged above the threshold with a second pairing candidate below the threshold and a matrix is generated based on the pairing candidates below the threshold. A lowest predicted total quantization cost between all pairing candidates represented within the matrix is determined and the pairing candidates that result in the lowest predicted total quantization cost are used to determine the coefficients of the filter. 1. A method , performed by a processing device , of determining factors of a filter , the method comprising:organizing pairings of angle values into pairing candidates;defining a threshold to indicate an upper bound on the number of pairing candidates;exchanging a first pairing candidate above the threshold with a second pairing candidate below the threshold;generating a matrix based on the pairing candidates below the threshold;determining a lowest predicted total quantization cost between all pairing candidates represented within the matrix; andusing the pairing candidates that result in the lowest predicted total quantization cost to determine the coefficients of the filter.2. The method of claim 1 , wherein a given pairing of angle values is represented by θp and θq claim 1 , and a first coefficient of a given stage of the filter is provided as −2·(cos θp+cos θq) while a second coefficient of the given stage of the filter is provided as 2·(1+2·cos θp·cos θq).3. The method of claim 1 , wherein the organizing comprises rearranging the pairings of angle values from a lowest quantization cost to a highest quantization cost.4. The method of claim 3 , wherein the quantization cost for a given pairing of angle values is associated with a number of bits required to represent the given ...

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Номер записи: 5
03-11-2016 дата публикации

Optimal Factoring of FIR Filters

Номер: US20160322959A1
Автор: JR. Alan N., Mehrnia Alireza, WILLSON
Принадлежит:

A method and system for the design and implementation of an optimally factored filter is presented. Pairs of angle values are organized in pairing candidates and a threshold is defined to indicate an upper bound on the number of pairing candidates. A first pairing candidate is exchanged above the threshold with a second pairing candidate below the threshold and a matrix is generated based on the pairing candidates below the threshold. A lowest predicted total quantization cost between all pairing candidates represented within the matrix is determined and the pairing candidates that result in the lowest predicted total quantization cost are used to determine the coefficients of the filter. 1. A method , performed by a processing device , for determining a sequence of a plurality of stages of a filter , the method comprising:determining a sum of squared coefficient values for each stage of the plurality of stages of the filter; a first stage position in the cascade includes a stage having a lowest sum of squared coefficient values among each stage of the plurality of stages, and', 'a subsequent stage position includes another stage of the plurality of stages, such that a partial filter comprising the another stage and each previous stage in the cascade has a lowest sum of squared coefficient values among the possible stages to choose for the another stage., 'arranging the plurality of stages of the filter in cascade such that2. The method of claim 1 , further comprising:identifying one or more stages in the arranged cascade having the highest sum of squared coefficient values among all of the stages in the arranged cascade; anddistributing the one or more stages having the highest sum of squared coefficient values among the other stages in the arranged cascade.3. The method of claim 2 , wherein the distributing comprises distributing such that the one more stages having the highest sum of squared coefficients are substantially spaced equally apart from one another in ...

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Номер записи: 6
05-06-2007 дата публикации

Bypassable adder

Номер: US7228325B2
Автор: Alan N. Willson, Jr., Larry S. Wasserman
Принадлежит: Pentomics Inc

An adder for adding a signal at a first input (A) and a second input (B) to produce an adder output (S) is disclosed. The adder comprises a bypass input (bypass) and a logic circuit, communicatively coupled to the bypass input (bypass), the first input (A), and the second input (B), the logic circuit configured to hold at least one of the first input (A) and the second input (B) according to the bypass input (bypass).

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Номер записи: 7
16-09-2010 дата публикации

Desensitized Filters with Droop Correction

Номер: US20100235420A1
Автор: Alan N. Willson, Jr.
Принадлежит: Pentomics Inc

A method and system for the design and implementation of desensitized digital filters with droop correction. The desensitized digital filter includes a first filter configured to receive an input signal, a decimator or upsampler, and a modified desensitized half-band filter. The first filter introduces droop into the passband of the desensitized digital filter. The desensitized half-band filter has a transfer function F(z)=K(1+z −1 )G(z) wherein K≠0 is a scale factor, that is modified to omit a (1+z −1 ) factor block. The modified desensitized half-band filter compensates for the passband droop introduced by the first filter. The first filter may be a sinc filter, CIC filter, or filter having similar properties.

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Номер записи: 8
10-10-2017 дата публикации

Optimal factoring of FIR filters

Номер: US9787288B2
Автор: Alan N. Willson, Jr., Alireza Mehrnia
Принадлежит: Willson Alan N Jr

A method and system for the design and implementation of an optimally factored filter is presented. Pairs of angle values are organized in pairing candidates and a threshold is defined to indicate an upper bound on the number of pairing candidates. A first pairing candidate is exchanged above the threshold with a second pairing candidate below the threshold and a matrix is generated based on the pairing candidates below the threshold. A lowest predicted total quantization cost between all pairing candidates represented within the matrix is determined and the pairing candidates that result in the lowest predicted total quantization cost are used to determine the coefficients of the filter.

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Номер записи: 9
23-02-2016 дата публикации

Efficient angle rotator configured for dynamic adjustment

Номер: US9268529B2
Автор: Alan N. Willson, Jr.
Принадлежит: Pentomics Inc

An apparatus and method for angle rotation is disclosed to rotate a complex input by the angle θ to produce a rotated complex output signal. A memory storage device generates control information based on a coarse angle θ M . A coarse rotation butterfly circuit uses the control information to rotate the complex input signal by the coarse angle θ M to produce an intermediate complex number. The control information controls one or more multiplexers and/or adders in the coarse rotation butterfly circuit to rotate the complex input signal. The fine rotation butterfly circuit uses the control information to rotate the intermediate complex number by a fine angle θ L to produce the complex output signal. The control information controls one or more multiplexers and/or adders in the fine rotation butterfly circuit to rotate the intermediate complex number.

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Номер записи: 10
19-03-2009 дата публикации

High-Speed System Having Compensation for Distortion in a Digital to-Analog Converter

Номер: US20090075595A1
Автор: Alan N. Willson, Jr., Tzu-Chieh Kuo
Принадлежит: Pentomics Inc

A method and system for the design and implementation of an inverse-sinc function that can efficiently process signals produced by high-speed systems is presented. An integrated inverse-sinc module accepts multiple data streams that may result from parallel sub-systems and creates multiple outputs that can be interleaved to produce a sequence that has been filtered by an inverse-sinc function. The multiple-input, multiple-output system may be beneficially operated at a low data rate, such as the data rate used by each of the sub-systems.

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Номер записи: 11
11-07-2017 дата публикации

Optimal factoring of FIR filters

Номер: US09705476B2
Автор: Alan N. Willson, Jr., Alireza Mehrnia
Принадлежит: Willson Alan N Jr

A method and system for the design and implementation of an optimally factored filter is presented. Pairs of angle values are organized in pairing candidates and a threshold is defined to indicate an upper bound on the number of pairing candidates. A first pairing candidate is exchanged above the threshold with a second pairing candidate below the threshold and a matrix is generated based on the pairing candidates below the threshold. A lowest predicted total quantization cost between all pairing candidates represented within the matrix is determined and the pairing candidates that result in the lowest predicted total quantization cost are used to determine the coefficients of the filter.

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Номер записи: 12
17-01-2017 дата публикации

Excess-fours processing in direct digital synthesizer implementations

Номер: US09547327B2
Автор: Alan N. Willson, Jr., Tianyu HU, Yunfan LIU
Принадлежит: Willson Alan N Jr

Systems and methods for a split phase accumulator having a plurality of sub phase accumulators are provided. Each sub phase accumulator receives a portion of a frequency control word. The first sub phase accumulator includes a first register and the remaining sub phase accumulators include a register and an overflow register. At each discrete point in time, the first sub phase accumulator is configured to be responsive to the first portion of the frequency control word at that discrete point in time and to the first sub phase accumulator value at the immediately previous discrete point in time, and each of the remaining sub phase accumulators is configured to be responsive to a value of its corresponding portion of the frequency control word at that discrete point in time and to the same second sub phase accumulator value at the immediately previous discrete point in time.

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Номер записи: 13