Abstract
In this study, a precision bandgap reference with a v-curve correction (VCC) circuit is presented. The proposed VCC circuit generates a correction voltage to reduce the temperature drift of the reference voltage and achieves a low temperature coefficient (TC) in a wide temperature range. The proposed bandgap reference was designed and fabricated using a standard TSMC 0.18- $\mu \text{m}$ 1P6M CMOS technology with an active area of 0.0139 mm2. The measured results show that the proposed bandgap reference achieves a TC of 1.9–5.28 ppm/°C over a temperature range of −40°C to 140 °C at a supply voltage of 1.8 V. In addition, the circuit demonstrated a line regulation of 0.033 %/V for supply voltages of 1.2 – 1.8 V at room temperature.
Highlights
Bandgap references are essential building blocks in analog and mixed-signal circuits, such as linear regulators, A/D converters, D/A converters, and power converters for their high precision and temperature independence [1]–[17]
Ma and Yu [10] proposed an opposite high-order curvature compensation by using MOS transistors operating in a weak inversion region for cancelling nonlinear temperature dependence
These cited bandgap references had an improvement in temperature coefficient (TC) over wide temperature ranges
Summary
Bandgap references are essential building blocks in analog and mixed-signal circuits, such as linear regulators, A/D converters, D/A converters, and power converters for their high precision and temperature independence [1]–[17]. Ma and Yu [10] proposed an opposite high-order curvature compensation by using MOS transistors operating in a weak inversion region for cancelling nonlinear temperature dependence These cited bandgap references had an improvement in TC over wide temperature ranges. A VCC circuit is proposed to improve the curvature of a reference voltage in a wide temperature range. The proposed VCC circuit generates a correction voltage having opposite-curvature curves to effectively reduce the temperature drift of a reference voltage. A reference voltage of less than 1 V is provided by multiplying Iref and Rref, as described in (1) Both OPA1 and OPA2 are implemented using a two-stage amplifier with an n-channel input pair in the proposed bandgap reference. The minimum supply voltage of the amplifier with a p-channel input pair is evaluated by VEB1 + VSG+ VSD ≈ 1.35 V
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