Broadband transconductance operational amplifier and buffer OPA660 common emitter (common-E) amplifier circuit

The figure shows the OPA660 common emitter (common-E) amplifier circuit. (a) The figure shows a discrete component common emitter amplifier, the transconductance changes over the entire temperature range, Vo is the inverting gain, and Vos is only a few volts. (b) The figure shows a common emitter amplifier composed of OPA660, the transconductance is constant over the entire temperature range, Vo is the non-inverting gain, and Vos=0V.