Patent US4590616A successfully refreshed from Google Patents.
US4590616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Re-tuning device comprising a switching mixer stage and a tuning oscillator
Assignee: US Philips Corp
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Filing: 1984-07-06
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Granted: 1986-05-20
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Expires: 2004-07-06
Abstract
Abstract RF-tuning device comprising a switching mixer stage (M) and a tuning oscillator (O) coupled thereto. According to the invention, so as to reduce the noise contribution of the mixer stage (M) without increasing the oscillator radiation, the slew rate of the oscillator switching signal applied to the mixer stage (M) is increased by connecting bistable trigger circuit between the tuning oscillator and the mixing stage. Under the control of the tuning oscillator, the bistable trigger circuit generates a substantially square-wave output signal.
Inventors
- 👤 Hendrik F. van Glabbeek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:21
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26; H04B1/28; H03; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1206; H03B5/1212; H03B5/1215; H03B5/1231; H04N; H04N5/00; H04N5/44; H04N5/50; H03B2200/00; H03B2200/006; H03B2200/0082; H03B2200/0088; H03B2200/0098; H03B2202/00; H03B2202/08; H03D; H03D7/00; H03D7/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
An RF-tuning device comprising a switching mixer stage for receiving an RF-input signal and a tuning oscillator coupled to an oscillator signal input thereof, characterized in that a bistable trigger circuit is connected between the tuning oscillator and the switching mixer stage oscillator signal input to increase the slew rate of an oscillator signal applied to said switching mixer stage oscillator signal input, wherein said bistable trigger circuit is actuated by zero crossings in an output signal of the tuning oscillator causing said bistable trigger circuit to generate a substantially square-wave output signal for application to said mixer stage as said oscillator signal.
Claim 2
Dependent Claim
103 words
An RF-tuning device comprising a switching mixer stage for receiving an RF-input signal and a tuning oscillator coupled to an oscillator signal input thereof, characterized in that a bistable trigger circuit is connected between the tuning oscillator and the switching mixer stage oscillator signal input to increase the slew rate of an oscillator signal applied to said switching mixer stage oscillator signal input, wherein said bistable trigger circuit is actuated by zero crossings in an output signal of the tuning oscillator causing said bistable trigger circuit to generate a substantially square-wave output signal for application to said mixer stage as said oscillator signal.
Claim 3
Dependent Claim
55 words
An RF-tuning device as claimed in claim 1, characterized in that the bistable trigger circuit comprises a differential input stage and a Schmitt trigger connected thereto, the differential input stage being coupled to an output of the tuning oscillator and the Schmitt trigger being coupled to a multiplying circuit included in the switching mixer stage.
Claim 4
Dependent Claim
138 words
An RF-tuning device as claimed in claim 2, characterized in that the Schmitt trigger comprises first and second transistors, the base inputs of these transistors being cross-coupled to the opposite collector outputs and being connected to first and second direct current sources, respectively, and the emitters of these transistors being connected to a common third direct current source, the currents through the first and second direct current sources being mutually substantially equal and the current through the third direct current source being not more than eight times the current through each of the first and second direct current sources, and that the differential input stage comprises third and fourth mutually balanced transistors, whose base inputs are connected to the output of the tuning oscillator and whose collector outputs are connected to a balanced input of the multiplying circuit.
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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |