US3764927A
Expired / Lapsed
US
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Wide band frequency discriminator
Assignee: General Datacomm Inc
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Filing: 1971-12-07
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Granted: 1973-10-09
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Expires: 1991-12-07
Abstract
Abstract A wide band frequency discriminator is described having at its input a first RC network and first limiter in parallel with a second RC network and second limiter. The RC time constants and the configuration of these two parallel circuits are chosen so that the inputs to the two limiters have a 90* phase difference. An EXCLUSIVE OR combines the outputs of the two limiters to produce a square wave having twice the frequency of the input signal. A differentiating circuit and one-shot further process the square wave signal to form a signal having four times the frequency of the input signal. The frequency of the input signal may then be detected by passing the output of the one-shot through a low-pass filter.
Inventors
- 👤 W Allinger
- 👤 S Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:28
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/02; H03D3/18; H03D3/20; H03D2200/00; H03D2200/0001; H03D2200/0039
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
148 words
A wide band frequency discriminator comprising: a first RC network and a first limiter that form a first output signal; a second RC network and a second limiter in parallel with the first RC network and first limiter, said second RC network and second limiter forming a second output signal; an input to said first and second RC networks; said first and second RC networks having the same RC product and a configuration such as to produce a 90* phase difference between the signals at outputs of the two limiters; means for combining the first and second output signals to produce a third output signal; means for further processing the third output signal including a one-shot; and a low-pass filter to which is applied the output of the oneshot, said low-pass filter detecting variations in the frequency of an input signal to the first and second RC networks.
Claim 2
Dependent Claim
148 words
A wide band frequency discriminator comprising: a first RC network and a first limiter that form a first output signal; a second RC network and a second limiter in parallel with the first RC network and first limiter, said second RC network and second limiter forming a second output signal; an input to said first and second RC networks; said first and second RC networks having the same RC product and a configuration such as to produce a 90* phase difference between the signals at outputs of the two limiters; means for combining the first and second output signals to produce a third output signal; means for further processing the third output signal including a one-shot; and a low-pass filter to which is applied the output of the oneshot, said low-pass filter detecting variations in the frequency of an input signal to the first and second RC networks.
Claim 3
Dependent Claim
20 words
The discriminator of claim 1 wherein the means for combining the first and second output signals is an EXCLUSIVE OR.
Claim 4
Dependent Claim
14 words
The discriminator of claim 1 further comprising means for differentiating the third output signal.
Claim 5
Dependent Claim
19 words
The discriminator of claim 3 wherein the one-shot has an input connected to the output of the differentiating means.
Claim 6
Dependent Claim
27 words
The discriminator of claim 1 wherein the first and second limiters are substantially identical high gain amplifiers that are driven to saturation at their power supply voltages.
Claim 7
Dependent Claim
118 words
A wide band circuit for processing an input signal comprising: a first RC network and a first limiter that form a first output signal; a second RC network and a second limiter in parallel with the first RC network and first limiter, said second RC network and second limiter forming a second output signal; an input to said first and second RC networks; said first and second RC networks having the same RC product and a configuration such as to produce a 90* phase difference between the signals at outputs from the two limiters; and means for combining the first and second output signals to produce a third output signal having twice the frequency of the input signal.
Claim 8
Dependent Claim
118 words
A wide band circuit for processing an input signal comprising: a first RC network and a first limiter that form a first output signal; a second RC network and a second limiter in parallel with the first RC network and first limiter, said second RC network and second limiter forming a second output signal; an input to said first and second RC networks; said first and second RC networks having the same RC product and a configuration such as to produce a 90* phase difference between the signals at outputs from the two limiters; and means for combining the first and second output signals to produce a third output signal having twice the frequency of the input signal.
Claim 9
Dependent Claim
20 words
The circuit of claim 6 wherein the means for combining the first and second output signals is an EXCLUSIVE OR.
Claim 10
Dependent Claim
14 words
The circuit of claim 6 further comprising means for differentiating the third output signal.
Claim 11
Dependent Claim
20 words
The circuit of claim 8 further comprising a one-shot having an input connected to the output of the differentiating means.
Claim 12
Dependent Claim
36 words
The circuit of claim 9 further comprising a low-pass filter to which is applied the output of the one-shot, said low-pass filter detecting variations in the frequency of the input signal to the wide band circuit.
Claim 13
Dependent Claim
27 words
The circuit of claim 6 wherein the first and second limiters are substantially identical high gain amplifiers that are driven to saturation at their power supply voltages.
Claim 14
Dependent Claim
104 words
A wide band circuit for processing an input signal comprising: a first limiter for forming a first output signal; a second limiter in parallel with said first limiter for forming a second output signal; an input to said first and second limiters; means between said input and both of said limiters for producing a 90* phase difference between the first and second output signals by producing a phase lead in one signal and a phase lag in the other signal; and means for combining the first and second output signals to produce a third output signal having twice the frequency of the input signal.
Claim 15
Dependent Claim
104 words
A wide band circuit for processing an input signal comprising: a first limiter for forming a first output signal; a second limiter in parallel with said first limiter for forming a second output signal; an input to said first and second limiters; means between said input and both of said limiters for producing a 90* phase difference between the first and second output signals by producing a phase lead in one signal and a phase lag in the other signal; and means for combining the first and second output signals to produce a third output signal having twice the frequency of the input signal.
Claim 16
Dependent Claim
20 words
The circuit of claim 12 wherein the means for combining the first and second output signals is an EXCLUSIVE OR.
Claim 17
Dependent Claim
14 words
The circuit of claim 12 further comprising means for differentiating the third output signal.
Claim 18
Dependent Claim
22 words
The circuit of claim 14 further comprising a one-shot having an input that is connected to the output of the differentiating means.
Claim 19
Dependent Claim
36 words
The circuit of claim 15 further comprising a low-pass filter to which is applied the output of the one-shot, said low-pass filter detecting variations in the frequency of the input signal to the wide band circuit.
Claim 20
Dependent Claim
27 words
The circuit of claim 12 wherein the first and second limiters are substantially identical high gain amplifiers that are driven to saturation at their power supply voltages.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |