H - Electricity – 04 – B
Patent
H - Electricity
04
B
179/2, 325/45
H04B 15/00 (2006.01) H03G 9/18 (2006.01) H04B 1/64 (2006.01)
Patent
CA 1195387
ABSTRACT OF THE DISCLOSURE: A noise reduction circuit has a main signal path and an auxiliary signal path having the characteristics of high-pass filter with a controllable cut-off frequency, a control circuit varies the cut-off frequency of the high-pass filter as a function of the auxiliary signal path output. The auxiliary signal path current is derived as a current source output so that the summing of the main signal and auxiliary signal can be accomplished by a single operational amplifier, without requiring a buffer amplifier as in known noise reduction circuits. The auxiliary signal path includes a voltage-to-current converter having differential inputs and differential outputs, with a PN junction pair and at least first and second common emitter transistor pairs connected to the differential outputs. The output current of the first common emitter transistor pair is fed back to a differential input terminal of the voltage-to-current converter, and the auxiliary signal path output is derived from the second emitter common transistor pair.
428798
Gowling Lafleur Henderson Llp
Sony Corporation
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