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In this paper, a new method to achieve very small current reference levels on integrated circuits with immunity to temperature variations using peaking current source with MOSFETs operating in subthreshold region is proposed. By adding a source degeneration resistor to the conventional peaking current source architecture, a zero temperature coefficient current can be generated. The proposed low-power...
This paper used a 4-level Frequency Shift Keying (4-FSK) modulation scheme to enhance the density of wireless data transfer from implantable biomedical microsystems to the outside world. Modeling and simulation of the wireless channel for 4-FSK modulation in the case of a neural recording implant has been done. To realize the 4-FSK scheme, the modulator and demodulator circuits are proposed, designed...
A general structure for capacitive digital to analog converters (CDACs) is presented in which non-binary, base-m capacitor sizing is introduced. Base-m sizing opens new trade-offs in area and INL/DNL efficiency. A base-4 (i.e., quaternary-weighted) DAC (QWDAC) is designed as an example of the proposed structure. This converter is designed and simulated after being laid out in a 0.18-μm CMOS technology...
This paper proposes a new coil structure for inductive powering to wearable/implantable biomedical devices. This structure is virtually independent from the direction (and alignment) of the receiving coil relative to the transmitting coil. In addition to conducting experimental tests and characterizations, the proposed coil structure (energized by a transmitting coil) has been used to power up a real...
This paper presents a low-voltage, CMOS-compatible, voltage-mode structure for multiple-valued logic circuits. Designed based on a simple and straightforward mechanism and operating in the voltage mode, the proposed structure is suitable for low power applications. Design of both a quaternary inverter and a latch circuit based on the proposed structure are also presented. These circuits are designed...
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