2 0.65 5 - pF VR = 1 V, f = 1 MHz VR = 25 V, f = 1 MHz VR = 28 V, f = 1 MHz Capacitance ratio VR = 1 V, VR = 25 V, f = 1 MHz Capacitance ratio CT1/C T25 CT1/C T28 ∆CT/C T 9.7 - - VR = 1 V, VR = .