US3906388A
Expired / Lapsed
US
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Direct-type binary frequency synthesizer for microwave frequencies
Assignee: SP-MICROWAVE Inc
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Filing: 1974-01-28
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Granted: 1975-09-16
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Expires: 1994-01-28
Abstract
Abstract An apparatus including means for providing at least four fixed internal frequency signals having four different values of frequency in which all of said frequencies are coupled into a first processor stage comprised of a single pole double throw switch controlled by a first input bit command signal for selecting either of two of said four frequencies for coupling into a first frequency mixer. A third frequency signal is also coupled into the first frequency mixer which provides a first difference frequency output signal that is coupled into a binary frequency divider. The divider output signal is then coupled along with a fourth frequency signal into a second frequency mixer which produces a second difference frequency output signal that is coupled into a third mixer in an output stage which also includes a second single pole double throw switch controlled by a second input bit command signal for selecting either of the same two of the four frequency signals to also be coupled into the third frequency mixer. The output signal produced by the third mixer is a discrete synthesizer frequency output signal selected from a range of frequency output signals in accordance with the input bit command signal. Additional identical processor stages may be added to provide smaller increments between the selectable discrete synthesizer frequency output signals.
Inventors
- 👤 John P Jones
- 👤 Ronald C Stirling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:51
CPC Classifications
H; H03; H03B; H03B21/00; H03B21/01; H03B21/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
111 words
A direct-type frequency synthesizer comprising frequency generator means for providing at least four synchronized output frequency signals at four different frequencies, F1, F2, F3 and F4, digital bit command signal means having at least first and second output terminals for providing digital command signals, processor means having at least four input terminals coupled to corresponding output terminals on said frequency generator means and responsive to said frequencies F1, F2, F3 and F4 respectively, said processor means having a fifth input terminal coupled to said first output terminal on said digital bit command signal means and an output terminal for providing a first frequency output signal having a frequency value equal to
Claim 2
Dependent Claim
111 words
A direct-type frequency synthesizer comprising frequency generator means for providing at least four synchronized output frequency signals at four different frequencies, F1, F2, F3 and F4, digital bit command signal means having at least first and second output terminals for providing digital command signals, processor means having at least four input terminals coupled to corresponding output terminals on said frequency generator means and responsive to said frequencies F1, F2, F3 and F4 respectively, said processor means having a fifth input terminal coupled to said first output terminal on said digital bit command signal means and an output terminal for providing a first frequency output signal having a frequency value equal to
Claim 3
Dependent Claim
140 words
A direct-type frequency synthesizer as recited in claim 1 further including additional processor means having at least four input terminals wherein three of said input terminals are coupled to corresponding output terminals on said frequency source and responsive to output frequency signals at frequencies F1, F2 and F4 respectively, a fourth input terminal is coupled to said output terminal on said first processor means, an output terminal coupled to said first terminal on said output difference circuit means and, said additional processor means having a fifth input terminal coupled to said first output terminal on said digital bit command signal means whereby said output circuit means provides discrete frequency output signals selectable in accordance with said digital command signals from an increased range of synthesizer output frequency signals having an increased number of increments within said increased range of frequencies.
Claim 4
Dependent Claim
37 words
A direct-type frequency synthesizer as recited in claim 1 in which said frequency generator means includes a crystal oscillator coupled to a divider network for providing said output frequency signals at frequencies F1, F2, F3 and F4.
Claim 5
Dependent Claim
33 words
A direct-type frequency synthesizer as recited in claim 1 in which said frequency generator means includes a plurality of synchronized oscillators for providing said frequency signals at frequencies F1, F2, F3 and F4.
Claim 6
Dependent Claim
60 words
A direct-type frequency synthesizer as recited in claim 4 in which said frequency generator means provides four output signals at frequencies of F1 9,000 MHz, F2 9,032 MHz, F3 8,000 MHz and F4 8,500 MHz, and five serially connected stages for providing discrete frequency output signal over the range from 1, 000 through 1,063 MHz in increments of 1 MHz.
Claim 7
Dependent Claim
131 words
A direct-type frequency synthesizer as recited in claim 1 in which said processor means includes a series circuit comprised of switching means having first and second input terminals responsive to said first and second synchronized output frequeNcy signals at frequencies F1 and F2 respectively, first difference frequency means having a first input terminal coupled to said switching means and a second input terminal coupled to said frequency generator means and responsive to said second synchronized output frequency signal at frequency F3 for providing a first frequency output signal having a frequency value equal to F2-F3 and a second frequency output signal having a frequency value equal to F1-F3, binary divider means coupled to said first difference frequency means for providing a first output frequency signal having a frequency value equal to
Claim 8
Dependent Claim
75 words
A direct-type frequency synthesizer as recited in claim 6 in which said series circuit further includes first band pass filter means and amplifier means coupled between said first difference frequency means and said binary divider means, second band pass filter means coupled between said binary divider means and said second difference frequency means, and third band pass filter means coupled to said second difference frequency means for providing said first and second frequency output signals.
Claim 9
Dependent Claim
22 words
A direct-type frequency synthesizer as recited in claim 6 in which said first and second difference frequency means include passive diode mixers.
Claim 10
Dependent Claim
30 words
A direct-type frequency synthesizer as recited in claim 1 in which said output difference circuit means includes switching means for selecting one of said two of said four frequency signals.
Claim 11
Dependent Claim
192 words
A direct-type frequency synthesizer as recited in claim 1 in which said output difference circuit means includes a series circuit comprising switching means having two input terminals coupled to said frequency generator means for receiving first and second synchronized output frequency signals at frequencies F1 and F2 respectively and a third input terminal coupled to said digital bit command signal means for providing a first output signal of frequency F1 and a second output signal of frequency F2, difference frequency mixing means having a first input terminal coupled to said switching means and a second input terminal coupled to said output terminal on said processor means for providing a first output frequency signal having a frequency equal to the difference between said frequency signal F2 and the frequency of the output frequency signal from said processor means and a second frequency output signal having a frequency value equal to the difference of said frequency signal F1 and the frequency of said output frequency from said processor means, and band filter means having an input terminal coupled to the output of said difference mixing means for providing first and second filtered output signals.
Claim 12
Dependent Claim
117 words
A direct-type frequency synthesizer comprising frequency generator means for providing at least six synchronized output frequency signals at frequencies F1, F2, F3, F4, F5 and one variable frequency F6, digiTal bit command signal means having at least three output terminals for providing separate digital command signals, processor means having at least five input terminals coupled to corresponding output terminals on said frequency generator means and responsive to said frequencies F1, F2, F3, F4 and F6 respectively, said processor means having sixth and seventh input terminals coupled to two of said three output terminals on said digital bit command signal means and an output terminal for providing a first frequency output signal having a frequency value equal to
Claim 13
Dependent Claim
117 words
A direct-type frequency synthesizer comprising frequency generator means for providing at least six synchronized output frequency signals at frequencies F1, F2, F3, F4, F5 and one variable frequency F6, digiTal bit command signal means having at least three output terminals for providing separate digital command signals, processor means having at least five input terminals coupled to corresponding output terminals on said frequency generator means and responsive to said frequencies F1, F2, F3, F4 and F6 respectively, said processor means having sixth and seventh input terminals coupled to two of said three output terminals on said digital bit command signal means and an output terminal for providing a first frequency output signal having a frequency value equal to
Claim 14
Dependent Claim
31 words
A direct-type frequency synthesizer as recited in claim 11 in which said frequency generator means includes a voltage tunable oscillator for providing said output frequency signal, F6, having a variable frequency.
Claim 15
Dependent Claim
43 words
A direct-type frequency synthesizer as recited in claim 11 in which said frequency generator means includes a crystal controlled oscillator coupled to a frequency divider network for producing said output frequency signals at said five fixed frequencies F1, F2, F3, F4, and F5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |