Variable gain amplifier
A gain amplifier, variable technology, applied in differential amplifiers, DC-coupled DC amplifiers, improving amplifiers to improve efficiency, etc., can solve problems such as affecting the next stage bias, achieve stable output current, reduce common mode Variation of output level, effect of reducing influence
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[0013] Based on the gain formula (1) of the above-mentioned prior art variable gain amplifier, it can be seen that the prior art variable gain amplifier changes the control voltage V bc , to change the gain G. However, in order to make the variation range of the gain G larger, it is necessary to make the control voltage V bc The change is large, that is, V b and V c The change is also large, correspondingly, I 2 The range of variation is also large, about the current source current I 1 ~0.
[0014] Based on the circuit structure of the above-mentioned prior art variable gain amplifier, its common mode output level is:
[0015] VO n =VO p =V cc -I 2 × R L . (2)
[0016] Based on the formula (2), it can be seen that the variation range of the common mode output level is about Vcc~Vcc-I 1 ×RL. When the current source current I 1 When the product I1×RL with the load resistance RL is relatively large, such as several hundred millivolts or even about 1V, the common-mo...
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