US4594555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency selective sampling detector
Assignee: Agilent Technologies Inc
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Filing: 1984-10-29
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Granted: 1986-06-10
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Expires: 2004-10-29
Abstract
Abstract A signal receiver having a frequency selective sampling detector which accepts a bandlimited analog signal and outputs uniformly spaced, digital samples of the signal's quadrature and in-phase components. The center frequency, phase reference and sample interval for the detector are derived from a single reference clock. The bandwidth of the detector is variable while maintaining the same center frequency.
Inventors
- 👤 Howard E. Hilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:12
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/007; H03D2200/00; H03D2200/0041; H03D2200/005; H03D2200/0054; H03D2200/006; H03D3/006; H03D7/00; H03D7/16; H03D7/165
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
A detector for detecting amplitude and phase of modulation on a carrier signal, said detector comprising a bandpass filter, for filtering the carrier signal received therefrom to a first selectable bandwidth at a first selectable center frequency: sample and hold means, coupled to the bandpass filter, for sampling the carrier signal received therefrom at a selectable rate; converter means, coupled to the sample and hold means, for converting the carrier signal received therefrom to digital data; first multiplier means, coupled to the converter means, for multiplying the digital data received therefrom by a first selectable signal to produce an in-phase component of the modulation of the carrier signal; second multiplier means, coupled to the converter means, for multiplying the digital data received therefrom by a second selectable signal to produce the quadrature component of the modulation of the carrier signal; and first and second filter means coupled to the first and second multiplier means, respectively, for filtering undesired components of the modulation signals received therefrom.
Claim 2
Dependent Claim
165 words
A detector for detecting amplitude and phase of modulation on a carrier signal, said detector comprising a bandpass filter, for filtering the carrier signal received therefrom to a first selectable bandwidth at a first selectable center frequency: sample and hold means, coupled to the bandpass filter, for sampling the carrier signal received therefrom at a selectable rate; converter means, coupled to the sample and hold means, for converting the carrier signal received therefrom to digital data; first multiplier means, coupled to the converter means, for multiplying the digital data received therefrom by a first selectable signal to produce an in-phase component of the modulation of the carrier signal; second multiplier means, coupled to the converter means, for multiplying the digital data received therefrom by a second selectable signal to produce the quadrature component of the modulation of the carrier signal; and first and second filter means coupled to the first and second multiplier means, respectively, for filtering undesired components of the modulation signals received therefrom.
Claim 3
Dependent Claim
246 words
A detector for detecting amplitude and phase on a carrier signal, said detector comprising: an attenuator for receiving the carrier signal; a first mixer, coupled to the attenuator, for down-converting the carrier signal received therefrom to a first selectable intermediate frequency; a first bandpass filter, coupled to the first mixer, for filtering the carrier signal received therefrom to a first selectable bandwidth at a first selectable center frequency; a second mixer, coupled to the first bandpass filter, for down-converting the carrier signal received therefrom to a second selectable intermediate frequency; a second bandpass filter, coupled to the second mixer, for filtering the carrier signal received therefrom to a second selectable bandwidth at a second selectable center frequency; sample and hold means, coupled to the second bandpass filter, for sampling the carrier signal received therefrom at a selectable rate; converter means, coupled to the sample and hold means, for converting the carrier signal received therefrom to digital data; first multiplier means, coupled to the converter means, for multiplying the digital data received therefrom by a first selectable signal to produce the in-phase component of the modulation of the carrier signal; second multiplier means, coupled to the converter means, for multiplying the digital data received therefrom by a second selectable signal to produce a quadrature component of the modulation of the carrier signal; and first and second filter means coupled to the first and second multiplier means, respectively, for filtering undesirable components of the modulation signals received therefrom.
Claim 4
Dependent Claim
246 words
A detector for detecting amplitude and phase on a carrier signal, said detector comprising: an attenuator for receiving the carrier signal; a first mixer, coupled to the attenuator, for down-converting the carrier signal received therefrom to a first selectable intermediate frequency; a first bandpass filter, coupled to the first mixer, for filtering the carrier signal received therefrom to a first selectable bandwidth at a first selectable center frequency; a second mixer, coupled to the first bandpass filter, for down-converting the carrier signal received therefrom to a second selectable intermediate frequency; a second bandpass filter, coupled to the second mixer, for filtering the carrier signal received therefrom to a second selectable bandwidth at a second selectable center frequency; sample and hold means, coupled to the second bandpass filter, for sampling the carrier signal received therefrom at a selectable rate; converter means, coupled to the sample and hold means, for converting the carrier signal received therefrom to digital data; first multiplier means, coupled to the converter means, for multiplying the digital data received therefrom by a first selectable signal to produce the in-phase component of the modulation of the carrier signal; second multiplier means, coupled to the converter means, for multiplying the digital data received therefrom by a second selectable signal to produce a quadrature component of the modulation of the carrier signal; and first and second filter means coupled to the first and second multiplier means, respectively, for filtering undesirable components of the modulation signals received therefrom.
Claim 5
Dependent Claim
40 words
A detector as in claim 1 wherein the first and second multiplier means multiply the digital data by a signal representing the relation e.sup.j2π (Fs/4)=cos 2π(Fs/4)+j sin 2π(Fs/4), where Fs is the frequency at which the carrier signal is sampled.
Claim 6
Dependent Claim
40 words
A detector as in claim 2 wherein the first and second multiplier means multiply the digital data by a signal representing the relation e.sup.j2π (Fs/4)=cos 2π(Fs/4)+j sin 2π(Fs/4), where Fs is the frequency at which the carrier signal is sampled.
References Cited (Backward Citations)
US4090145A
Cited
US3970946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |