Title:
SELF OSCILLATING MIXER
Document Type and Number:
WIPO Patent Application WO2002041488
Kind Code:
A3
Abstract:
A self oscillating mixer circuit (20) includes a dual gate FET (22), an NDR device (25) coupled to a first gate of the FET, and a first bias input circuit (30) adapted to couple a first bias voltage (VG1) across the NDR device. The first bias voltage controls operation of the NDR device within an NDR region of the V-I characteristic curve of the NDR device so that oscillations occur in the NDR device and the FET. The first bias input circuit is adjustable to adjust the applied first bias voltage so as to control frequency and amplitude of the oscillations. An RF input terminal (34) and a second bias input circuit (35) are coupled to supply a second bias voltage (VG2)at the other gate terminal, which biases the FET at maximum gain so that RF signals applied to the RF input terminal are mixed with the oscillations.
Inventors:
NAIR VIJAY
EL ZEIN NADA
GORONKIN HERBERT
EL ZEIN NADA
GORONKIN HERBERT
Application Number:
PCT/US2001/045777
Publication Date:
July 31, 2003
Filing Date:
November 02, 2001
Export Citation:
Assignee:
MOTOROLA INC (US)
International Classes:
H03D7/12; (IPC1-7): H03D7/12
Foreign References:
| US4112373A | 1978-09-05 | |||
| US4605909A | 1986-08-12 | |||
| US5450227A | 1995-09-12 | |||
| US4112377A | 1978-09-05 |
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