Low-power programmable high-gain time difference amplifier with regeneration time control

A gain controllable SR-latch-based time difference amplifier (TDA) with a gain of up to 150 by controlling the regeneration time constant, especially with programmable transconductance (g_m), is presented. The presented g_m control uses resistor degeneration at the input switches so that the effective g_m is reduced, whereas the time difference gain increases. Unavoidable large crowbar current from the slow regeneration is avoided by shifting to the fast regeneration mode after regeneration is completed, which effectively reduces current consumption by 29.3%.