Realizationof SOI Fully Intergrated Highly Linearity Gm-C Filter for Temperature Compensation
Sun Shu-lon · Dianzi qijian · 2015
A fully differential Operational Amplifier is proposed,which is adopted the voltage feedback technology to stablize the common mode output voltage,the Vthcan be adjusted according to the substrate bias on the input differential pairs,resulting in the change of the Gm of the amplifier as well as the cut-off frequency of the filter,which can be untilized to compensate the frequency offset caused by the temperature fly. The 3th order Chebyshev low pass filter is complemented on the 0. 13 μm SOI GSMC technics,source voltage is 1. 2 V and consists of 6 layermetals.The filter can achieve 0 d B voltage gain in the pass-band,8 MHz cut-off frequency-1 d B gain and 35 d B attenuation at 38 MHz,the ripple within band achieves 0. 5 d B,when 1 MHz,400 m V Vpp sine signal applied into the circuit,the THD can reach-57 d B,and consumes 7 m W power from the source,In special application,it takes remarkable advantage.