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A Compact Low Voltage CMOS Four-Quadrant Analog Multiplier
A Compact Low Voltage CMOS Four-Quadrant Analog Multiplier

... modulator is shown in Fig. 5. A 0.4V, 25 kHz sinusoidal carrier signal V12 shown in Fig. 5(a) was multiplied by a 0.4V, 1 kHz sinusoidal modulating signal V34 shown in Fig. 5(b). A resulting waveform is shown in Fig. 5(c). Frequency response of the multiplier for various gains was set by sweeping V3 ...
CS 110 – Lecture 2
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... output for all possible inputs (note that this isn't how we usually specify functions – there is no way to enumerate all integers or reals, for example) A truth table for a circuit with N inputs and M outputs has 2N rows and M output columns. Two circuits compute the same function if they have the s ...
Exp_Ohmic Circuit Elements
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MAX7031 Low-Cost, 308MHz, 315MHz, and 433.92MHz FSK Transceiver with Fractional-N PLL General Description
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... designed to transmit and receive FSK data at factorypreset carrier frequencies of 308MHz †, 315MHz, or 433.92MHz with data rates up to 33kbps (Manchester encoded) or 66kbps (NRZ encoded). This device generates a typical output power of +10dBm into a 50Ω load, and exhibits typical sensitivity of -110 ...
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... VDD =8V). The DC connection for the upper device gates runs across the length of the die. Pads 2 and 5 are both on this DC connection but are on opposite ends of the die. The VG2 connection can therefore be placed on either pad. A bypass capacitor is recommended on both ends, pads 2 and 5. Not conne ...
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... The detection of small currents at low frequency is impaired by the scientist’s ability to reliably detect the signal above noise. Noise from circuit components and electronic pickup in a lab can bury valuable information in digitized buzz. Reducing noise in the frequency regime below 1 kHz is espec ...
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... time, the German scientists Herbert Mataré and Heinrich Welker also invented a similar transistor [2]. A radio transceiver was successfully demonstrated using these transistors and later Mataré founded a company and launched first commercial radio product. In 1958, Jack Kilby and Robert Noyce develo ...
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to read Design Consideration

... desire immediately defined the minimum step size for the volume control at 0.5dB. With a 0.5dB step the channel balance can be altered in 1dB steps by incrementing one channel by 0.5dB and decrementing the other channel by the same amount. Thus keeping the total audio output unchanged. The final nee ...
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Regenerative circuit



The regenerative circuit (or regen) allows an electronic signal to be amplified many times by the same active device. It consists of an amplifying vacuum tube or transistor with its output connected to its input through a feedback loop, providing positive feedback. This circuit was widely used in radio receivers, called regenerative receivers, between 1915 and World War II. The regenerative receiver was invented in 1912 and patented in 1914 by American electrical engineer Edwin Armstrong when he was an undergraduate at Columbia University. Due partly to its tendency to radiate interference, by the 1930s the regenerative receiver was superseded by other receiver designs, the TRF and superheterodyne receivers and became obsolete, but regeneration (now called positive feedback) is widely used in other areas of electronics, such as in oscillators and active filters. A receiver circuit that used regeneration in a more complicated way to achieve even higher amplification, the superregenerative receiver, was invented by Armstrong in 1922. It was never widely used in general receivers, but due to its small parts count is used in a few specialized low data rate applications, such as garage door openers, wireless networking devices, walkie-talkies and toys.
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