Please identify the status of the MOSFETS in the following amplifier circuit. Vin = Vin1 - Vin2, Vout = Vout1 - Vout2. Vthp = -0.5V, Vthn = 0.5 V, Vb = 2.4 V, VDD = 3.3 V, and Vin1 = Vin2 = 2 V, after measurement, we found that Vc = 1.1 V, and Vout1 = Vout2 = 1.8V. Please identify the status of the MOSFET M1-M4, including if it is turned on, which operating region (triode or saturation) it belongs to.
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