US4638180A
Expired / Lapsed
US
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Frequency divider circuits
Assignee: Panasonic Holdings Corp
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Filing: 1985-03-07
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Granted: 1987-01-20
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Expires: 2005-03-07
Abstract
Abstract A wide band analog frequency divider circuit operable at a high frequency in the GHz band. The analog frequency divider circuit comprises an LC series circuit having a capacitor and an inductor connected between the anode and the cathode of a diode, and means for applying a forward bias to the diode. The input signal is supplied from the anode side of the diode, and the output is delivered from the cathode side, or the anode side if the cathode is grounded.
Inventors
- 👤 Morikazu Sagawa
- 👤 Yoshikazu Mori
- 👤 Motoi Ohba
- 👤 Mitsuo Makimoto
- 👤 Sadahiko Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:34
CPC Classifications
H; H03; H03B; H03B19/00; H03B19/16; H03B19/18
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
67 words
A frequency divider circuit comprising: a diode component supplied with an input signal from the anode side; the capacitance of said diode component varying in accordance with the voltage applied thereacross; an LC series circuit having a capacitor and an inductor connected in parallel with said diode component; and means for forward biasing said diode component, whereby a frequency-divided output signal is obtained from said diode component.
Claim 2
Dependent Claim
67 words
A frequency divider circuit comprising: a diode component supplied with an input signal from the anode side; the capacitance of said diode component varying in accordance with the voltage applied thereacross; an LC series circuit having a capacitor and an inductor connected in parallel with said diode component; and means for forward biasing said diode component, whereby a frequency-divided output signal is obtained from said diode component.
Claim 3
Dependent Claim
22 words
A frequency divider circuit according to claim 1, wherein said frequency divided-output is delivered from the cathode side of said diode component.
Claim 4
Dependent Claim
38 words
A frequency divider circuit according to claim 1, wherein the cathode side of said diode component is grounded, said input signal is supplied from the anode side, and said frequency-divided output is also delivered from the anode side.
Claim 5
Dependent Claim
39 words
A frequency divider circuit according to claim 1, wherein the ratio between the frequencies of said output and input signals is changed by varying the forward bias voltage applied between the anode and the cathode of said diode component.
Claim 6
Dependent Claim
32 words
A frequency divider circuit according to claim 1, wherein said means for biasing includes a temperature compensating circuit, said temperature compensating circuit compensating for fluctuations in the temperature of said diode component.
Claim 7
Dependent Claim
17 words
A frequency divider circuit according to claim 5, wherein said temperature compensating circuit includes a temperature-dependent resistor.
Claim 8
Dependent Claim
16 words
A frequency divider circuit according to claim 5, wherein said temperature compensating circuit includes a diode.
Claim 9
Dependent Claim
19 words
A frequency divider circuit according to claim 1, wherein said means for forward biasing is a constant current source.
Claim 10
Dependent Claim
23 words
A frequency divider circuit according to claim 1, wherein said diode component comprises one of a switching diode, PIN diode, and varactor diode.
Claim 11
Dependent Claim
19 words
A frequency divider circuit according to claim 1, wherein said diode component comprises the base-collector portion of said transistor.
Claim 12
Dependent Claim
19 words
A frequency divider circuit according to claim 1, wherein said diode component comprises the base-emitter portion of said transistor.
Claim 13
Dependent Claim
36 words
A frequency divider circuit according to claim 1, further comprising a high-pass filter matching circuit and a low-pass filter matching circuit respectively connected to the input side and the output side of said frequency divider circuit.
Claim 14
Dependent Claim
88 words
A frequency divider circuit according to claim 1, further comprising a filter circuit selected from the group consisting of a low-pass filter having a cutoff frequency higher than the frequency of said output signal and lower than the frequency of said input signal, a bandpass filter having a center frequency corresponding to the frequency of said output signal, and a bandstop filter having a center frequency corresponding to the frequency of said input signal, said filter circuit being connected to the output side of said frequency divider circuit.
Claim 15
Dependent Claim
81 words
A frequency divider circuit comprising: a plurality of frequency dividers connected in cascade, each of said frequency dividers including, a diode component supplied with an input signal from the anode side; the capacitance of said diode component varying in accordance with the voltage applied thereacross, an LC series circuit comprising a capacitor and an inductor connected in parallel with said diode component, and means for forward biasing said diode component, whereby a frequency-divided output signal is obtained from said diode component.
Claim 16
Dependent Claim
81 words
A frequency divider circuit comprising: a plurality of frequency dividers connected in cascade, each of said frequency dividers including, a diode component supplied with an input signal from the anode side; the capacitance of said diode component varying in accordance with the voltage applied thereacross, an LC series circuit comprising a capacitor and an inductor connected in parallel with said diode component, and means for forward biasing said diode component, whereby a frequency-divided output signal is obtained from said diode component.
Claim 17
Dependent Claim
128 words
A frequency divider circuit for generating an output signal having a frequency which is a subharmonic of the frequency of an input signal applied thereto, comprising an input terminal for receiving said input signal and an output terminal at which said output signal is generated; a diode having an anode coupled to said input and output terminals and a cathode coupled to ground, the capacitance of said diode varying in accordance with the voltage applied between the anode and cathode thereof; a series circuit connected between the anode and cathode of said diode, said series circuit consisting of a capacitor and an inductor; and means for applying a positive bias voltage to the anode of said diode with respect to the cathode thereof thereby forward biasing said diode.
Claim 18
Dependent Claim
128 words
A frequency divider circuit for generating an output signal having a frequency which is a subharmonic of the frequency of an input signal applied thereto, comprising an input terminal for receiving said input signal and an output terminal at which said output signal is generated; a diode having an anode coupled to said input and output terminals and a cathode coupled to ground, the capacitance of said diode varying in accordance with the voltage applied between the anode and cathode thereof; a series circuit connected between the anode and cathode of said diode, said series circuit consisting of a capacitor and an inductor; and means for applying a positive bias voltage to the anode of said diode with respect to the cathode thereof thereby forward biasing said diode.
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |