The main purpose of this work is to design a continuous-time low pass filter with Gm-C structure to meet the specifications of different standards includingGSM, WCDMA, IEEE 802.11b/g, and WiMAX. Since trans-conductancecircuit, denoted by Gm, is the main part of this structure, a Gm circuit with an adaptive dc triode MOSFET (ADTM) structure is used to implement the filter. The circuit structure is characterized by twofeatures; first, the input transistorare kept itrioderegion by using a negative feedback loop. The negative feedback increases the output impedance of the circuit and thus provides a wide linearity range in the designed trans-conductance circuit in which the drain voltageis used as the control voltage. Second, an adaptive dc circuit has been uased to reduce the amount of power consumption. Simulation results in a 0.18 ?m CMOS technology show that the transconductance of the voltage to current converter can be changed between 3.5 uS to 340 uS by adjusting the control voltage. The designed low pass filter can be used in the previously mentioned standards with the capability of changing its bandwidth between 200 KHz to 12.5 MHz. Simulation results also indicate that for the case of 12.5 MHzbandwidth and input signal amplitude of 0.4V, the total harmonic distortion (THD) of the output voltage islower than 1%. Two-tone test on the filter proves an in-band IIP3 of 27dBm and 24.8dBm for 2.5MHz and 10MHz bandwidth, respectively. In order to reduce the filter bandwidth variation due to the process and temperature changes a phase lockedloop (PLL) circuit is implemented to keep the variation of the cut-off frequency lower than 10%. Key words : Voltage to current converter, Transconductance, Distortion and phase locked loop