Amplifier and method for adding bandwidth via current injection
A technology of amplifier and bandwidth, which is applied in DC-coupled DC amplifiers, differential amplifiers, improved amplifiers to expand bandwidth, etc., and can solve problems such as device size increase and bandwidth upper limit
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[0024] figure 2 is a schematic diagram of a first embodiment of the amplifier 20 of the present invention. Amplifier 20 can increase bandwidth and maintain high gain under current injection conditions. The amplifier 20 includes an input stage 22 and a load stage 24 . The input stage 22 includes two transistors M1 and M2, and the load stage 24 includes a plurality of transistors M31, M41, M51, M61, M71, M81. Transistor M9 is used as a current source to draw a fixed reference current I Q to control multiple currents I a -I d current value. If both transistors M1 and M2 are in the conduction state, the current I a with I c The sum of is equal to figure 1 The current shown in I 1 , while the current I b with I d The sum of is equal to figure 1 The current shown in I 2 . In one embodiment, the circuit structures of the input stage 22 and the load stage 24 are the same as figure 1 The circuit structure of the input stage 12 shown in is the same as that of the load st...
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