Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1997-06-30
2000-02-22
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455333, 455327, 327361, H04B 126
Patent
active
060290595
ABSTRACT:
A quadrature mixer architecture that mixes the in-phase and quadrature phases within the same cell. The input voltage is applied to the base of a voltage conversion transistor, which converts the input voltage into a bias current on the collector of the voltage conversion transistor. Four mixer transistors have their emitters connected to the collector of the drive transistor so as to receive the bias current. The bases of a first pair of the upper transistors are fed with the in-phase components (e.g., 0 and 180.degree.), while the bases of the other pair of transistors are fed with the quadrature phase components (e.g., 90 and -90.degree. of a local oscillator). The collectors of the mixer transistors are taken as the four output components of the circuit, I.sub.out, I.sub.out.sbsb.--, Q.sub.out, and Q.sub.out.sbsb.--.
REFERENCES:
patent: 4313089 (1982-01-01), Predina
patent: 5448772 (1995-09-01), Grandfield
patent: 5630228 (1997-05-01), Mittel
patent: 5642071 (1997-06-01), Sevenhans et al.
patent: 5805988 (1998-09-01), Clayton et al.
patent: 5809410 (1998-09-01), Stuebing et al.
Armstrong Darnell R.
Eisenzopf Reinhard J.
Lucent Technologies - Inc.
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