摘要:
PROBLEM TO BE SOLVED: To provide a differential amplifier circuit, wherein IIP3 is improved while making high CMRR or IIP2 being advantages of differential circuit. SOLUTION: The differential amplifier circuit according to the present invention includes: first and second load stages each having a predetermined resistance value; a main differential amplifier unit having a first differential stage that forms a differential pair in such a way as to amplify a difference between a first input voltage and a second input voltage, and a constant current source, which has a predetermined current driving capability and is connected serially between a power source voltage terminal and a ground terminal; and an auxiliary differential amplifier unit having a second differential stage that forms a differential pair in such a way as to amplify a difference between a third input voltage and a fourth input voltage connected between the first load stage and the second load stage, and the ground, respectively. COPYRIGHT: (C)2006,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To provide a frequency mixer capable of preventing the linearity of a local oscillation signal differential pair from being deteriorated even when the amplitude of an RF input signal is large. SOLUTION: The frequency mixer comprises: an N channel MOS transistor M1; N channel MOS transistors M2 and M3 configuring the local oscillation signal differential pair 100 and each having substantially the same characteristic; and loads Z4, Z5. The gate of the N channel MOS transistor M1 receives the RF signal, the gates of the N channel MOS transistors M2, M3 receive a local oscillation signal, drain currents of the N channel MOS transistors M2, M3 are outputted to the drain of the N channel MOS transistor M1. An amplitude-current conversion circuit 400 receives the RF signal and provides an output of an output current to the drain of the N channel MOS transistor M1 so as to monotonously decrease the output current with respect to the amplitude of the RF signal. COPYRIGHT: (C)2005,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To provide a frequency conversion circuit capable of frequency conversion even if the amplitude of a local signal is low, and suppressing increase in power consumption.SOLUTION: A frequency conversion circuit generates a multiplication signal by multiplying an amplification signal, that is generated by an amplification part containing a first transistor in which a drain terminal is connected to a first power supply potential, with a local signal. The frequency conversion circuit includes a converter that contains a second transistor to convert the amplification signal to a current signal, an impedance element which connects the amplification part to the converter at high impedance in terms of AC and delivers a DC current input from the amplification part to the converter, and a switching circuit which contains two third transistors connected in parallel, is connected to the drain terminal of the converter through the impedance element, and multiplies the current signal with the local signal to generate the multiplication signal.
摘要:
A power mixer architecture for a transmitter chip is disclosed. The power mixer architecture is a mixing stage including one or more upper trees, and one or more lower trees. Each lower tree is selectively activated to receive current biasing signals, and current intermediate frequency signals. Upon receipt, the activated lower tree activates a corresponding upper tree to receive one or more amplified current intermediate frequency signals from the lower tree. In conjunction with a reception of voltage local oscillating signals, the upper tree provides voltage radio frequency signals. The gain of the lower tree is designed to be constant over any variance in a temperature, supply voltage or processing performance of the transmitter chip.
摘要:
PROBLEM TO BE SOLVED: To provide a spin high-frequency mixer capable of having improved noise characteristics, and to provide a method of manufacture thereof. SOLUTION: A spin high-frequency mixer includes: a spin current generator 30 generating a spin current upon input of a local oscillator signal; a TMR (tunnel magnetoresistance effect) device 50 which inputs a high-frequency signal and the spin current generated by the spin current generator 30 and generates a mixed signal; and an output device 60 outputting the generated mixed signal from the TMR device. Generation of shot noise at a passive mixer is suppressed almost without including shot noise caused by a current of the local oscillator signal. COPYRIGHT: (C)2010,JPO&INPIT