Low-level 2-transistor linear rundown circuit

MOST available methods for converting pulse height to pulse width use high-amplitude pulses requiring linear amplifiers, but its size and economy make the low-level, 2-transistor circuit used here most desirable. It achieves linear rundown, and a conversion from pulse height to pulse width can be achieved by adding a differentiating circuit. The circuit forms a linear rundown activated by a constant current generator discharging a capacitor. Because the rundown length is directly proportional to pulse height, it can convert pulse height to width efficiently.