This paper presents an ultralow-power CMOS linear transconductor design operating in weak inversion for low frequency g m-C filter design for potential biomedical applications, where the transconductance should be low to reduce the capacitor size, and linear to minimize distortion. Bulk-driven and degeneration techniques are used, and we have adopted this G m cell as a linear source degeneration resistor to achieve a 91% reduction in the transconductance value. In addition, a fourth-order Butterworth bandpass filter was designed in a proprietary 0.35-μm BCD (bipolar-CMOS-DMOS) process by Texas Instruments (TI). The SPICE simulation results indicate that the total harmonic distortion is greatly reduced to less than 71 dB at an input of 100 mV. The power consumption is only 750 nW at a 3-V supply voltage.
|Number of pages||4|
|State||Published - 2012|
|Event||2012 IEEE International Symposium on Circuits and Systems, ISCAS 2012 - Seoul, Korea, Republic of|
Duration: May 20 2012 → May 23 2012
|Conference||2012 IEEE International Symposium on Circuits and Systems, ISCAS 2012|
|Country||Korea, Republic of|
|Period||05/20/12 → 05/23/12|