Achieving stable high-gain video amplification using the Miller-effect transformation

The pass band and gain of cascaded linear-amplifier stage is limited by the shunt reactance of the Miller impedance presented by the following stage. This paper presents a method of utilizing the Miller effect to provide control of bandwidth, stability and loading resulting in greatly improved video-amplifier performance. The design illustration provides more than 5500-Mc voltage gain-bandwidth product with a power gain better than one billion (10⁹) without using inductive components. The voltage gain change from 55°C to 85°C is less than 1 db as is the voltage gain change for ±30 per cent variations in power-supply voltage. The wide-band noise figure is 1.6 db. Topics discussed are: 1) Deliberate loading by Miller effect, 2) Stability control by Miller effect, 3) Bandwidth control by Miller effect.