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A simple voltage controlled oscillator (VCO) with negative voltage-frequency (V-F) relation is presented in this paper. The realization technique is based on the use of commercial available devices to generate tunable sawtooth and square wave signals. Decreasing the control voltage linearly increases the output oscillation frequency. The proposed VCO consists of operational transconductance amplifiers...
This paper presents an electronic oscillator specially designed to be controlled in oscillation frequency by the control voltage and external bias current signals. The realization technique is simple and inexpensive based on the use of commercial available devices. The proposed circuit consists of operational transconductance amplifiers (OTAs) and an RS flip flop to generate tunable sawtooth and square...
We have developed a system-in-a-package (SiP) consisting of a sound source LSI and a speaker amplifier LSI for mobile applications, and have measured its signal-to-noise ratio (SNR). The sound source LSI chip is stacked on the speaker amplifier LSI chip with inserting a silicon spacer between these chips. Two types of interposers were applied to the SiP: one-metal polyimide tape and a two-metal glass...
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