Question

What is low-voltage low-power differential-input single-ended output amplifier? How to design it?

Answer 1

Ans. 10wVOLTAGE LOW POWER DIFFERENTIAL INPUT SINGLE ENDED OUTPUT AMPLIFIER There are requirements of low power, high performan difference amplifiers to convert Small differential Signals (low voltage] to a readable ground. referenced output Signale Input voltages at two inputs usually share a large common-mode voltage. The differential amplifier rejects the common mode voltage and remaining voltage is amplified and presented on the ampliffer output as Single- ended voltage The rejected voltage can either be AC or DC and this common mode voltage is typically larger than the differential input voltage. The effectiveness of the rejection diminishes as the frequency of comman- mode voltage increases. A high performance, high bandwidth dual amplifier performs better with high frequency than discrete amplifiers. DESIGN Use dual precision Amplie amplifiers with resistive gain network. The circuit shows a simple way of converting a differential input to a single - ended output with adjustable gain.

Your = - Grain X (VINI - VN 2)! where. gain = RE IKA VIN! - Vol 3 differential input voltage Rot la RF RG2 = 1ka Grain Тұл т 1k л 2 kr 1k u kr This technique provides a more stable reading when EML or REL is present therefore, recommended when noise is a problem.

The circuit is specially true where measuring thermocouple, strain gage and bridge type pressure sensor inputs, which produce very small signals ( low voltage) in noisy environment The accuracy of system elepends on tolerance of the network resistorse The cirwit can convert a differential input to a single-ended inputs by not output with an adjustable gun, The gain of system can be set by the ratio of RF and RG1 with ass umption that RG2 = RG1 and amplifier B has a gain of -