Biasing high frequency BJT cascode amplifier

Published: 25/09/2018
Biasing high frequency BJT cascode amplifier
Source: ELECTRONICS.STACKEXCHANGE.COM

So far, no one in the course has gotten both primary spec: 14.125 (with 1 V/V swing either way) nor 3dB-bandwidth of 500kHz to 20MHz using the 2N4427 ( datasheet ). Vcc = 9V I_CQ = 10mA-15mA I have four questions about the cascode BJT amplifier. 1) I found some practical advice, here and here , saying this: [I]n the real world, for frequencies above 2MHz, a second emitter follower buffer stage is

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