跨阻再次罢工：利用MDACs实现电流电压转换

rate of closure between the open- and closed-loop-gain curve equals 20 dB/decade. To do so, select an amplifier with unity-gain bandwidth of less than f1 or greater than f2.

It is easy to design a stable circuit if f1 is higher than the amplifier’s bandwidth:

Alternatively, if f2 is lower than the intersection of the open- and the closed-loop-gain curve, use:

CF≤–CIN+1/(2/π(RF||RD)fU).

Use these calculated values of feedback capacitance as starting points for your test circuit. Circuit parasitics, device-manufacturing variations, and other factors can encourage you to modify the feedback-capacitor value.

Stabilizing the MDAC’s analog signal is critical. However, also consider amplifier noise, input bias current, offset voltage, MDAC resolution, and glitch energy.