Temperature-to-frequency conversion apparatus

摘要

A temperature-to-frequency converter circuit of the type utilizing a pair of threshold switches connected across a timing capacitor for controlling a circuit output voltage to higher and lower magnitudes when the capacitor voltage respectively reaches higher and lower levels, has a linear conductance-vs.-temperature network between the output and the timing capacitance. The circuit operates as an astable multivibrator having an output frequency linearly related to temperature. The output waveform is an essential symmetrical squarewave, facilitating use with low-cost counting and display circuitry and providing a reduced level of electromagnetic interference.