A new circuit to measure a subfemto-farad coupling capacitance is proposed. This circuit converts current by coupling signal into amplified voltage. This circuit consists of cascode current mirror and trans impedance amplifier to improve the measureme...
A new circuit to measure a subfemto-farad coupling capacitance is proposed. This circuit converts current by coupling signal into amplified voltage. This circuit consists of cascode current mirror and trans impedance amplifier to improve the measurement resolution. Simulation results are obtained by HSPICE in a 0.35㎛ CMOS standard technology. When 300 atto-farad capacitance is measured, the maximum error rate is 2.27%.