Abstract
This work presents a single-stage, inverter-based, pseudo-differential amplifier that can work with ultra-low supply voltages. A novel common-mode stabilization loop allows proper differential operations, without impacting over the output differential performance. Electrical simulations show the effectiveness of this amplifier for supply voltages in the range of 0.3–0.5 V. In particular, a dc voltage gain of 25.16 dB, a gain-bandwidth product of 131.9 kHz with a capacitive load of 10 pF, and a static current consumption of only 557 nA are estimated at VDD = 0.5 V. Moreover, the circuit behavior with respect to process and temperature variations was verified. Finally, the proposed amplifier is employed in a switched-capacitor integrator and in a sample-and-hold circuit to prove its functionality in case-study applications.
Highlights
In recent years, the demand for circuits capable of working with very low supply voltages has increased
Inverter-Based Amplifier we present a pseudo-differential, single-stage, inverter-based amplifier for ultra-low voltage (ULV)
Proposed Pseudo-Differential Inverter-Based Amplifier this topology in ULV applications is the capability of working with supply voltages lower than the sum of the nMOS
Summary
The demand for circuits capable of working with very low supply voltages has increased. Thesebecause, architectures absence of a non-inverting input, in most circuits the operational amplifier non-inverting terminal several intrinsic benefits, such as: (i) strong rejection of CM interferences, (ii) larger output range, and is grounded, equivalently, fixed to a constant voltage to meet input common-mode (CM)for range (iii) improvedor,linearity. To make these topologies working correctly, a proper system the requirements. SC circuits area illustrated in Section stabilization of the output CM voltage is necessary [8]
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