Device-mismatch-insensitive current divider
In this paper, a new iterative process for current division is presented and a circuit implementing the process proposed. In this process, each iteration consists of two phases and each phase involves only one signal sampling. By means of this process, the accuracy of the current division is made insensitive to the device mismatch. The circuit implementing the process is simple and the step of adjustment per iteration is variable, so that an accurate adjustment can quickly be reached after a few iterations. Also, in this circuit, the effect of the switching noise is reduced by applying a simple and effective technique.
Very accurate current divider
This letter presents a new current divider principle based on CMOS dynamic current sources. The proposed method is characterised by very accurate current division without any matching requirements or component trimmings. Among the different applications of this new principle, the D/A conversion field is probably the most important.
Compact nA/V triode-MOSFET transconductor
A simple nA/V CMOS transconductor for low-frequency gm-C filters is presented. To benefit from the lowest gm/ID ratio, input transistors operate in the triode region, with gm adjusted by their (W/L) and VDS, the latter a tuning-voltage replica. Since VDS surmounts the equivalent noise of the replica circuit, excellent control of gm is attained. Simulations support theoretical analysis. A 5Hz bandpass filter was designed, featuring SNR=59.2 dB for THD<1% at 150 mV and 17 nW consumption.