H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/104
H03F 3/14 (2006.01) D06B 21/00 (2006.01) D06B 23/16 (2006.01) H03F 1/34 (2006.01) H03F 1/56 (2006.01) H03G 3/04 (2006.01)
Patent
CA 1104220
ABSTRACT OF THE DISCLOSURE A gain and impedance switching circuit for an amplifier includes an AF amplifier having an input impedance connected between the input terminal thereof and a reference point and a feedback circuit connected between the feedback and output terminals of the amplifier, a first series circuit consisting of a first impedance and a first ON/OFF switch and connected between the input terminal of the AF amplifier and a reference point (such as ground) and a second series circuit consisting of a second impedance and a second ON/OFF switch connected between the feedback terminal of the AF amplifier and the reference point, the first and second ON/OFF switches being ganged with each other so as to change the input impedance and the gain of the AF amplifier simultaneously. -1-
309836
Kawada Hirohito
Suzuki Tadao
Gowling Lafleur Henderson Llp
Sony Corporation
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