Patent US6460142B1 successfully refreshed from Google Patents.
US4648129A
Expired / Lapsed
US
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Frequency converter
Assignee: Toshiba Corp
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Filing: 1984-08-17
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Granted: 1987-03-03
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Expires: 2004-08-17
Abstract
Abstract A frequency converter includes a mixer, a local oscillator connected to the mixer by a line which transmits a local oscillator signal to the mixer and a starter circuit for supplying a transient bias current to the mixer for insuring the start of the local oscillations.
Inventors
- 👤 Kenji Hirai
- 👤 Hideki Torizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:22
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A frequency converter for converting an input signal, comprising: a mixer receiving the input signal; a local oscillator for transmitting a local oscillator signal to said mixer, the input signal being mixed in said mixer with said local oscillator signal, and starter means for supplying a transient bias current to said mixer for a predetermined period of time after said local oscillator and said starter means are supplied with a voltage from a drive power source, said bias current changing load conditions of said mixer to insure said local oscillator begins transmitting said local oscillator signal.
Claim 2
Dependent Claim
96 words
A frequency converter for converting an input signal, comprising: a mixer receiving the input signal; a local oscillator for transmitting a local oscillator signal to said mixer, the input signal being mixed in said mixer with said local oscillator signal, and starter means for supplying a transient bias current to said mixer for a predetermined period of time after said local oscillator and said starter means are supplied with a voltage from a drive power source, said bias current changing load conditions of said mixer to insure said local oscillator begins transmitting said local oscillator signal.
Claim 3
Dependent Claim
22 words
The frequency converter as defined in claim 1 wherein an intermediate frequency filter is connected between said starter means and said mixer.
Claim 4
Dependent Claim
21 words
The frequency converter as defined in claim 1 wherein said starter means includes a capacitor and a resistance connected in series.
Claim 5
Dependent Claim
24 words
The frequency converter as defined in claim 1 also including means for supplying a voltage to said local oscillator and said starter means simultaneously.
Claim 6
Dependent Claim
14 words
The frequency converter as defined in claim 1 wherein said mixer includes a diode.
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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |