Quasi T-coil CMOS power detector with self bias embedded amplifier

In this paper power detector (PD) using quasi T-coil matching network is designed. Further for low power signal detection an amplifier is embedded with detector circuit. The detector works on the nonlinear characteristics of short-channel MOS devices operating in either a saturation or subthreshold regime to generate a dc current that is proportional to the input signal power. The operating region of MOS devices depends on input power levels. The input-matching networks of PDs can flatten the ratio between the effective input power of a PD and the incident wave versus frequency; therefore, the output dc voltage may remain constant for incident signals with a fixed power value and the power detector can be use for wideband frequency operation.Finally performance of the circuit will be analyzed by plotting graph for output voltage versus input power. High gain over range of frequencies is found out from graph of gain versus frequency in dB scale.