US5263194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zero if radio receiver for intermittent operation
Assignee: Seiko Instruments Inc
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Filing: 1990-03-07
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Granted: 1993-11-16
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Expires: 2010-03-07
Abstract
Abstract A radio receiver for use with a time slot paging system which receives intermittent data includes a direct coupled zero IF receiver circuit with at least one automatic gain control (AGC) amplifier stage. DC offset errors are removed from the AGC amplifier stages by a timed zero adjustment circuit that is switched into the AGC circuit just prior to the receipt of data. The resulting zero IF circuit may be miniaturized in monolithic form making it ideal for use in a wristwatch sized pager.
Inventors
- 👤 Lawrence H. Ragan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:42
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/30; H04W; H04W52/00; H04W52/02; H04W52/0209; H04W52/0212; H04W52/0216; H04W52/0261; H04W52/0274; H04W52/028; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
A zero IF receiver for processing radio signals that are modulated on a carrier signal comprising: (a) RF means for receiving the radio signals; (b) zero IF down conversion means for converting said radio signals to near zero IF signals; (c) direct coupled amplifier means coupled to said zero IF down conversion means for providing gain to said near zero IF signal; and (d) zero adjustment means coupled to said amplifier means for removing DC voltage offsets; said direct coupled amplifier means comprising a plurality of amplifier stages and further including switching means for sequentially coupling said zero adjustment means to each of said amplifier stages in turn.
Claim 2
Dependent Claim
108 words
A zero IF receiver for processing radio signals that are modulated on a carrier signal comprising: (a) RF means for receiving the radio signals; (b) zero IF down conversion means for converting said radio signals to near zero IF signals; (c) direct coupled amplifier means coupled to said zero IF down conversion means for providing gain to said near zero IF signal; and (d) zero adjustment means coupled to said amplifier means for removing DC voltage offsets; said direct coupled amplifier means comprising a plurality of amplifier stages and further including switching means for sequentially coupling said zero adjustment means to each of said amplifier stages in turn.
Claim 3
Dependent Claim
49 words
The zero IF amplifier of claim 11 wherein said switching means couples said zero adjust means to each of said amplifiers in a predetermined sequence, said sequence starting with an amplifier stage coupled to said zero IF down conversion means and proceeding through each stage to a final stage.
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) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |