A Linear MOS Transconductor Using Source Degeneration and Adaptive Biasing
نویسنده
چکیده
This paper presents a new configuration for linear MOS voltage-to-current conversion (transconductance). The proposed circuit combines two previously reported linearization methods [1], [2]. The topology achieves 60-dB linearity for a fully balanced input dynamic range up to 1 at a 3.3-V supply voltage, with slightly decreasing performance in the unbalanced case. The linearity is preserved during the tuning process for a moderate range of transconductance values. The approach is validated by both computer simulations and experiments.
منابع مشابه
Design of Highly Linear CMOS Gm-Cell for Continuous time filter Applications
There are various filter types that are appropriate for the implementation of on-chip continuous time filters. Those are active-RC filters, switched-capacitor filters and Gm-C filters. Though high linearity is an advantage of both active-RC and switched-capacitor filters, these filters have a disadvantage of operating at high frequency ranges due to the limitation of the unity bandwidth of the ...
متن کاملA wide-linear-range subthreshold CMOS transconductor employing the back-gate effect
We present a CMOS circuit that utilizes the back-gate effect to extend the linear range of a subthreshold MOS transconductor. Previous designs of wide-linear-range transconductors using bipolar transistors employed multiple differential pairs with input offset voltages used to shift the individual transfer functions. These voltages were chosen to maximize the linear range of the summed differen...
متن کاملA CMOS “Soft-Switched” Transconductor and Its Application in Gain Control and Filters
This paper presents a transconductor suitable for implementation in submicron CMOS technology. The transconductor is nearly insensitive for the second-order effects of the MOS transistors, which become more and more prevalent in today’s submicron processes. The transconductor relies on a differential pair with variable degeneration resistance, while the degeneration resistors are “soft-switched...
متن کاملCharge-based Cmos Fir Adaptive Filter
A low-power, high-density CMOS design for an LMS adaptive FIR filter is presented. A combination of charge-based and subthreshold MOS circuits is used for filtering and adaptation. Accurate analog linear filtering is achieved through pulse-width modulation of input signal. A wide dynamic range is obtained by biasing the MOS switched current sources in the subthreshold regime, with the filter co...
متن کاملLow-voltage Highly-linear Transconductor Design in Subthreshold Cmos
We present four circuits implemented in subthreshold CMOS which greatly increase the linear range over the basic di erential pair. These circuits are appropriate for low voltage applications since there is no stacking of saturated transistors. The rst circuit topology employs multiple asymmetric di erential pairs. The second is a symmetric \bump" transconductor. The remaining two use source deg...
متن کامل