Abstract
Operational transconductance amplifiers are high gain amplifiers with wide bandwidth. The main advantage of those circuits is their capability to drive high resistive and capacitive loads at their outputs. Due to such capability, such circuits consume high power. While in some applications where the current consumption may vary in wide ranges the self-current of those amplifiers may succeed the load current, thus decreasing the efficiency coefficient of the designs. To reduce the intrinsic current consumption without impacting the performance and functionality, a novel method of an operational transconductance amplifier output stage design is proposed in this paper. The programmable output stage, in which the output cascade can operate in two different modes using a digital control signal has been designed. As a result, the parameters of the operational amplifier become more flexible to be tuned and configured after production. The output impedance, amplifier transconductance, bandwidth and other main parameters can be easily controlled based on the system state. If the load at the output enters the power down mode, the impedance of the amplifiers decreases the current and vice versa. The solution has been tested in the modern 14nm FinFet technology and the achieved results have ensured the capability of the proposed solution to be integrated with modern analog integrated circuits.
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