Signal amplitude and phase homodyne

Claim 2

Improved homodyne detection apparatus responsive to an applied signal comprising: first means for generating a plurality of quadrature related signal waveforms, each waveform having a frequency component corresponding to the frequency of said applied signal; second means responsive to said applied signal and said signal waveforms for developing a plurality of successive product signals, each selectively proportional to the product of said applied signal and one of said signal waveforms; third means for storing each of said product signals; and fourth means for selectively combining said stored signals.

Claim 3

The apparatus defined in claim 1 wherein said second means includes a product modulator and a low-pass filter.

Claim 4

The apparatus defined in claim 2 wherein said second means further comprises: a plurality of gate circuits, each gate circuit responsive to only one of said plurality of signal waveforms; means for successively enabling each of said gate circuits; and means for applying the output signals of said gate circuits to said product modulator.

Claim 5

The apparatus of claim 1 wherein said plurality of signal waveforms comprises first, second, third, and fourth periodic pulse trains and wherein said second pulse train lags said first pulse train by pi /2 radians, said third pulse train lags said second pulse train by pi /2 radians, and said fourth pulse train lags said third pulse train by pi /2 radians.

Claim 6

An improved homodyne detector responsive to an applied input signal comprising: first means for periodically generating a plurality of successive quadrature related periodic signal waveforms, each waveform having a fundamental frequency equal to the frequency of said input signal; second means responsive to said input signal and said successive periodic signal waveforms for developing a plurality of product signals, each proportional to the product of said applied input signal and one of said signal waveforms; third means for filtering said product signals; fourth means for storing each of said filtered product signals; and fifth means for selectively combining said stored signals.

Claim 7

An improved homodyne detector responsive to an applied input signal comprising: first means for periodically generating a plurality of successive quadrature related periodic signal waveforms, each waveform having a fundamental frequency equal to the frequency of said input signal; second means responsive to said input signal and said successive periodic signal waveforms for developing a plurality of product signals, each proportional to the product of said applied input signal and one of said signal waveforms; third means for filtering said product signals; fourth means for storing each of said filtered product signals; and fifth means for selectively combining said stored signals.

Claim 8

The apparatus defined in claim 5 wherein said second means includes a product modulator.

Claim 9

The apparatus defined in claim 5 wherein said first means further comprises: means for simultaneously generating a plurality of quadrature related periodic signal waveforms; a plurality of gate circuits, each gate circuit responsive to only one of said plurality of signal waveforms; means for successively enabling each of said gate circuits; and means for applying the output signals of said gate circuits to said second means.

Claim 10

The apparatus defined in claim 7 wherein said means for generating said plurality of signal waveforms comprises: first and second multivibrators each having first and second inputs and first and second outputs; a plurality of logic circuits, each logic circuit respectively connected to one of said inputs of said first and second multivibrators; and a source of timing signals connected to an input of each of said logic circuits, the first output of said second multivibrator connected to an input of said logic circuit connected to said first multivibrator first input, the second output of said second multivibrator connected to an input of said logic circuit connected to said first multivibrator second input, the first output of said first multivibrator connected to an input of said logic circuit connected to said second multivibrator second input, and the second output of said first multivibrator connected to an input of said logic circuit connected to said second multivibrator first input.

Claim 11

The apparatus of claim 5 wherein said plurality of signal waveforms comprises first, second, third, and fourth periodic pulse trains and wherein said second pulse train lags said first pulse train by pi /2 radians, said third pulse train lags said second pulse train by pi /2 radians, and said fourth pulse train lags said third pulse train by pi /2 radians.

Claim 12

An improved homodyne detector responsive to an applied input signal comprising: first means for periodically generating a plurality of successive periodic signal waveforms, each waveform having a fundamental frequency corresponding to the frequency of said input signal and electrically displaced from a preceding waveform by a phase shift of pi /2 radians; second means responsive to said input signal and said successive periodic signal waveforms for developing a plurality of signals, each proportional to the product of said input signal and one of said signal waveforms; third means for filtering said product signals; fourth means for storing each of said filtered product signals; and fifth means for arithmetically combining said stored signals.

Claim 13

An improved homodyne detector responsive to an applied input signal comprising: first means for periodically generating a plurality of successive periodic signal waveforms, each waveform having a fundamental frequency corresponding to the frequency of said input signal and electrically displaced from a preceding waveform by a phase shift of pi /2 radians; second means responsive to said input signal and said successive periodic signal waveforms for developing a plurality of signals, each proportional to the product of said input signal and one of said signal waveforms; third means for filtering said product signals; fourth means for storing each of said filtered product signals; and fifth means for arithmetically combining said stored signals.

Claim 14

An improved homodyne detector responsive to an applied input signal comprising: first means for generating a plurality of signal waveforms, each waveform having a fundamental frequency equal to the frequency of said input signal and shifted one from another by a phase shift of pi /2 radians; second means responsive to said input signal and an applied waveform for developing a signal proportional to the product of said input signal and an applied waveform; third means for successively applying said phase shifted waveforms to said second means; fourth means for filtering each of the successively developed product signals; fifth means for storing each of said filtered product signals; and sixth means for arithmetically combining said stored signals.

Claim 15

An improved homodyne detector responsive to an applied input signal comprising: first means for generating a plurality of signal waveforms, each waveform having a fundamental frequency equal to the frequency of said input signal and shifted one from another by a phase shift of pi /2 radians; second means responsive to said input signal and an applied waveform for developing a signal proportional to the product of said input signal and an applied waveform; third means for successively applying said phase shifted waveforms to said second means; fourth means for filtering each of the successively developed product signals; fifth means for storing each of said filtered product signals; and sixth means for arithmetically combining said stored signals.

Claim 16

The apparatus defined in claim 11 wherein said first means comprises: first and second multivibrators each having first and second inputs and first and second outputs; a pluraLity of logic circuits, each logic circuit respectively connected to one of said inputs of said first and second multivibrators; and a source of timing signals connected to an input of each of said logic circuits, the first output of said second multivibrator connected to an input of said logic circuit connected to said first multivibrator first input, the second output of said second multivibrator connected to an input of said logic circuit connected to said first multivibrator second input, the first output of said first multivibrator connected to an input of said logic circuit connected to said second multivibrator second input, and the second output of said first multivibrator connected to an input of said logic circuit connected to said second multivibrator first input.

Claim 17

The apparatus defined in claim 11 wherein said third means comprises: a plurality of gate circuits, each gate circuit responsive to only one of said plurality of signal waveforms; means for successively enabling each of said gate circuits; and means for applying the output signals of said gate circuits to said second means.

Claim 18

The apparatus of claim 11 wherein said plurality of signal waveforms comprises first, second, third, and fourth periodic pulse trains and wherein said second pulse train lags said first pulse train by pi /2 radians, said third pulse train lags said second pulse train by pi /2 radians, and said fourth pulse train lags said third pulse train by pi /2 radians.

Claim 19

Amplitude and phase measuring apparatus responsive to an applied signal comprising: first means for periodically generating a plurality of successive signal waveforms, each waveform having a fundamental frequency equal to the frequency of said applied signal and electrically displaced from an immediately preceding waveform by a phase shift of pi /2 radians; second means responsive to said applied signal and said successive waveforms for successively developing a plurality of signals, each proportional to the product of said applied signal and one of said waveforms; third means for filtering each of said plurality of product signals; fourth means for separately storing each of said filtered product signals; fifth means for selectively combining said stored signals to remove undesired error components; and sixth means responsive to said combined signals for developing signals proportional to the phase and amplitude of said applied signal.

Claim 20

Amplitude and phase measuring apparatus responsive to an applied signal comprising: first means for periodically generating a plurality of successive signal waveforms, each waveform having a fundamental frequency equal to the frequency of said applied signal and electrically displaced from an immediately preceding waveform by a phase shift of pi /2 radians; second means responsive to said applied signal and said successive waveforms for successively developing a plurality of signals, each proportional to the product of said applied signal and one of said waveforms; third means for filtering each of said plurality of product signals; fourth means for separately storing each of said filtered product signals; fifth means for selectively combining said stored signals to remove undesired error components; and sixth means responsive to said combined signals for developing signals proportional to the phase and amplitude of said applied signal.

Claim 21

The apparatus defined in claim 15 wherein said second means includes a mixer.

Claim 22

The apparatus defined in claim 16 wherein said first means further comprises: means for generating said plurality of signal waveforms; a plurality of gate circuits, each gate circuit responsive to only one of said plurality of signal waveforms; means for successively enabling each of said gate circuits; and means for applying the output signals of said gate circuits to said mixer.

Claim 23

The apparatus defined in claim 17 wherein said means for generating comprises: first and second multivibrators each having first and second inputs and first and second outputs; a plurality of logic circuits, each logic circuit respectively connected to one of said inputs of said first and second multivibrators; and a source of timing signals connected to an input of each of said logic circuits, the first output of said second multivibrator connected to an input of said logic circuit connected to said first multivibrator first input, the second output of said second multivibrator connected to an input of said logic circuit connected to said first multivibrator second input, the first output of said first multivibrator connected to an input of said logic circuit connected to said second multivibrator second input, and the second output of said first multivibrator connected to an input of said logic circuit connected to said second multivibrator first input.

Claim 24

The apparatus of claim 18 whereiN said plurality of signal waveforms comprises first, second, third, and fourth periodic pulse trains and wherein said second pulse train lags said first pulse train by pi /2 radians, said third pulse train lags said second pulse train by pi /2 radians, and said fourth pulse train lags said third pulse train by pi /2 radians.