EP0434203A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Cross-coupled mixer stage for zero IF radio
Assignee: Nortel Networks Ltd
•
Filing: 1990-11-09
•
Granted: —
•
Expires: 2010-11-09
Abstract
Abstract An arrangement for mixing r.f. signals with local oscillator signals wherein r.f. signals are fed to two separate balanced amplifiers (11,12) the outputs of which are fed to two separate balanced mixer stages (13,14) together with balanced local oscillator signals in quadrature, wherein the two outputs from each amplifier are fed one to each mixer stage.
Inventors
- 👤 George Hedley Storm Rokos
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:01
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/14; H03D7/1425; H03D7/1433; H03D7/1458; H03D7/16; H03D7/165; H03D2200/00; H03D2200/0041; H03D2200/0082
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
An arrangement for mixing r.f. signals with local oscillator signals wherein r.f. signals are fed to two separate balanced amplifiers with balanced outputs, which outputs are fed to two separate balanced mixer stages together with local oscillator signals in quadrature, characterised in that the two outputs from each amplifier are fed one to each mixer stage.
Claim 2
Dependent Claim
24 words
An arrangement according to claim 1 characterised in that the quadrature oscillator signals are each balanced, and the mixers are both double balanced mixers.
Claim 3
Dependent Claim
59 words
An arrangement according to claim 2, characterised in that each of the differential amplifiers is a long-tailed pair transistor amplifier, and each of the double balanced mixers comprises two pairs of transistors with emitters connected in common, the current to each such pair of emitters being supplied from the collector of one of the transistors of a long-tailed pair.
Claim 4
Dependent Claim
20 words
An arrangement according to claim 3 including a cascode amplifying stage between the amplifier output connections and the mixer inputs.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.