Design of a microelectronic circuit to amplify and modulate the signal of a micro-electro-mechanical systems arterial pressure sensor
2010
In the article, the design and stimulation is presented of an integrated circuit for the amplification and
modulation of an electrical signal proceeding from a Micro-Electro-Mechanical Systems (MEMS)
arterial pressure sensor. The signal consists of voltage ranking from 0-10 mV, 1 mA and frequency of 50-
500 Hz. This simple but effective design consists of an operational amplifier (op-amp) configured as a
differential amplifier, which amplifies the signal (up to 1V and 10 mA), originating from a Wheatstone
bridge in the MEMS sensor, and then this signal is modulated by Pulse width modulation (PWM). The
technology employed in this circuit is MOSIS AMIS 1.5 um. The circuit was designed with a two-state
op-amp, which is utilized in diverse stages of the system. The use of a differential amplifier, the op-amp,
and PWM simplifies the design and renders this compact due to the employment of few components (40
transistors). The use of the PWM facilitates the signaling process at later stages. Results comprise the
design of the circuit and the simulation. This consists of a schematic diagram of the layers of all the rules
specified in the MOSIS AMIS 1.5 um. Electric and LTSpice software was employed for the design and
simulation of the circuit. We present a complete description of the design philosophy, design criteria,
figures, and final results.
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