Precising Complex-Compensated Current Reference Based on Differential Mode of Currents

Abstract

A current reference with complex compensation using negative temperature coefficient of multiple currents is proposed. The principle of compensation is introduced in detail. This work generates two different compensated currents in the whole temperature range, which is different from the traditional curvature-compensated circuit. The compensation is achieved by using difference of the negative temperature coefficients. Piecewise curvature-compensation and higher order nonlinear temperature compensation are applied at the same time. The proposed circuit is simple and easy to implement. Results of simulation with HSPICE show that the achieved temperature coefficient is only 34.2 ppm/°C compared with 364 ppm/°C under 1 μm BCD process, which is unnecessary to compensate in the range of -25°C ∼ 125°C at 5 V supply voltage.

Low‐quiescent‐current flexible mode buck–boost converter

“…We can conclude from Fig. 2 that DRVA, DRVB and PWM_AB are always in the same phase [12, 14–16], so are the signals DRVC, DRVD and CD.…”

“…Four switches are divided into two switch pairs: SA and SC, SB and SD. The output of multiplexer, controlling four switches [16], is PWM control signal or BURST control signal determined by the signal BURST, as shown in Fig. 5.…”