BARBOSA JÚNIOR, I. S.; http://lattes.cnpq.br/8520822086555275; BARBOSA JÚNIOR, Isaías de Sousa.
Abstract:
The Programmable Gain Amplifier is a circuit capable of conveniently changing its gain
to address various levels of amplification. The circuit which design is described in this
work is intended to be within the receiver sub-domain of a Bluetooth Low-Energy system,
which finds applications on the Internet of Things industry, finding application on the
healthcare field, for instance. The topology proposed in this work is built by combining
a source degenerated first stage, a common-source with resistive load second stage, and
a transconductance boosting circuit interface to realize an amplifier that has ultra low
power consumption (< 104 μW) and occupies an area of 0,004 mm2. Each differential
output of the circuit is loaded with 2 pF, value that is the estimated load taking into
consideration the loading imposed for the following block of a receiver architecture, i.e.
the Analog-to-Digital Converter. Designed in a CMOS 0,13 μm technology and with a
supply voltage of 1 V, the simulations on the extracted view of the developed circuit
have resulted in maximum power dissipation of 103.1 μW, minimum bandwidth of 7.56
MHz, noise of 32.14 nV/!Hz, and gain range of 2.56 - 19.69 dB, portraying a better
performance respective to noise, gain range per stage and area when compared to recent
works. The phase margin of the core circuit is no greater than 104.8◦ and no less than 49◦.