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A compact nano-power fourth-order bandpass filter operating from a 0.5V supply, with an adjustable center frequency ranging from 125Hz to 16kHz, is presented. The filter is constituted from cascadable second-order circuit cells that are realized by a network of three transistors and two capacitors comprising only one branch of bias current. The measurement results of the filter fabricated in a 0.18-μm...
This paper presents an implementation of a least voltage drop neural biphasic stimulator circuit applied in cochlear implants. Using a double loop negative feedback topology, the output impedance of the current generator is increased, while requiring only one effective drain-source voltage drop (Veff). This allows the circuit to convey more charge into the tissue. The circuit can provide a biphasic...
A nano-power 4th-order band-pass filter operating from a 0.5 V supply voltage with an adjustable center frequency, ranging from 250 Hz to 4 kHz (4 octaves), is presented. The filter is constituted from cascadable 2nd-order circuit cells that are realized by a network of three transistors and two capacitors comprising only one branch of bias current. As a result of the compact low voltage circuit architecture,...
This paper presents a feedback technique to increase the output resistance of a MOS current mirror circuit that requires only one effective drain-source voltage drop. The proposed circuit requires a few additional current braches to form two feedback loops. With its compact structure, the proposed circuit is suitable as a current generator for neural stimulation. Simulation results, using 0.35 μm...
According to recent physiological experiments, the envelope and phase of speech signals are required to enhance the perceptive capability of a cochlear implant processor. In this paper, the design of an analog complex gammatone filter is introduced in order to extract both envelope and phase information of the incoming speech signals as well as to emulate the basilar membrane spectral selectivity...
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