H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/115
H04B 1/26 (2006.01) H03C 1/54 (2006.01) H03D 7/12 (2006.01) H04B 1/28 (2006.01)
Patent
CA 1064114
FREQUENCY CONVERTER ABSTRACT OF THE DISCLOSURE A frequency converter of the type having a local oscillating stage for producing a local oscillating signal and a double-balanced type mixing stage provided with a first pair of inputs for receiving a signal to be frequency converted and a second pair of inputs for receiving the local oscillating signal. The output of the mixing stage can be connected through a tuned circuit so as to frequency convert the input signal to an intermediate frequency (IF) signal. The local oscillating stage includes a first pair of differentially-connected tran- sistors, the collector electrode of one being connected to a resonant circuit and, additionally, through an RC positive feed- back circuit to the base electrode of the other transistor. The double-balanced type mixing stage includes a second pair of differentially-connected transistors, one of which being con- nected in cascade with a first differential amplifier and the other of which being connected in cascade with a second differ- ential amplifier. The base electrodes of the second pair of differentially-connected transistors receive the local oscillat- ing signal which is applied thereto in opposite phase relation. The first and second differential amplifiers both receive the input signal which is applied thereto in opposite phase relation. A DC bias circuit is provided for applying substantially equal bias voltages through equal impedances, such as resistors, to both pairs of differentially-connected transistors. Preferably, the DC bias circuit includes an emitter-follower. -i-
264197
Ohsawa Mitsuo
Yamatani Wataru
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