Design and simulation of programmable band-gap reference circuit

Band-gap voltage reference circuits are used to provide an independent reference voltage, which remains immune to power supply, temperature. One of the limitations of these circuits is they provide a single, unique value of voltage which is stable. Any effort to change this value will make the circuit voltage, temperature dependent. The voltage will be constant only for one voltage value and varies for other voltage values. In this work, we propose, a new circuit for generation of temperature and power supply independent, reference voltages which can be changed digitally. The best part of this circuit is, each output voltage value developed using this circuit, remains constant over a wide temperature range of -60° C to 120° C. This circuit generates four such voltages. The required value can be selected by using 3 different control lines.