H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/20, 330/24
H03F 3/30 (2006.01) H03F 1/08 (2006.01) H03F 3/347 (2006.01) H03F 3/45 (2006.01) H04R 25/00 (2006.01)
Patent
CA 1312359
CANADA INVENTOR: STEPHEN WEBSTER TITLE: IMPROVED OPERATIONAL AMPLIFIER STAGES ABSTRACT OF THE DISCLOSURE The improved operational amplifier stages are an input, a gain and an output stage. The input stage has a differential buffer amplifier connected to a transconductance section for converting a differential voltage signal to a current signal. The input stage is operable within a range of differential voltage signals, the range including common mode voltage signals at or beyond the negative supply rail. The gain stage has two cascaded transistors. The base of the first transistor is connected to the emitter of the second transistor through an integrating capacitor. The capacitor is further connected through a resistor to the negative supply rail. The output stage has a driving amplifier and two common emitter output transistors. One output transistor is driven by the amplifier through two current mirrors, the output of the second current mirror being compared to a reference current source. The other output transistor is driven by the amplifier.
546821
Bereskin & Parr
Linear Technology Inc.
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