A brain computer interface BCI is a communication system that interprets brain activity into commands for a computer or other devices .This technology is the emphasis of a rapidly growing research and development initiative that is greatly exciting e
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ELECTROENCEPHALOGRAPHY CIRCUIT & HARDWARE
BASIC CIRCUIT
INSTRUMENT AMPLIFIER
FEATURES OF INA114 LOW OFFSET VOLTAGE: 50mV max LOW DRIFT: 0.25mV/°C max LOW INPUT BIAS CURRENT: 2nA max HIGH COMMON-MODE REJECTION:
115dB min INPUT OVER-VOLTAGE PROTECTION: ±40V WIDE SUPPLY RANGE: ±2.25 to ±18V LOW QUIESCENT CURRENT: 3mA max 8-PIN PLASTIC AND SOL-16
DESCRIPTION OF INA114 The INA114 is a low cost, general purpose instrumentation
amplifier offering excellent accuracy. Its versatile 3-op amp design and small size make it ideal for a wide range of applications. A single external resistor sets any gain from 1 to 10,000. Internal input protection can withstand up to ±40V without damage. The INA114 is laser trimmed for very low offset voltage (50mV), drift (0.25mV/°C) and high common-mode rejection (115dB at G = 1000). It operates with power supplies as low as ±2.25V, allowing use in battery operated and single 5V supply systems. Quiescent current is 3mA maximum. The INA114 is available in 8-pin plastic and SOL-16 surface-mount packages. Both are specified for the –40°C to +85°C temperature range.
FILTERING BY USING OP27 IN NOTCH FILTER
CHIP OP27
FEATURES OF OP27 LOW NOISE: 4.5nV/√Hz max at 1kHz o LOW OFFSET: 100μV max o LOW DRIFT: 0.4μV/°C o HIGH OPEN-LOOP GAIN: 117dB min o HIGH COMMON-MODE REJECTION: 100dB min o HIGH POWER-SUPPLY REJECTION: 94dB min o
DESCRIPTION OF OP27 The OPA27 and OPA37 are ultra-low noise, high-precision
monolithic operational amplifiers. Laser-trimmed thin-film resistors provide excellent long-term voltage offset stability and allow superior voltage offset compared to common zener-zap techniques. A unique bias current cancellation circuit allows bias and offset current specifications to be met over the full –40°C to +85°C temperature range. The OPA27 is internally compensated for unity-gain stability.
