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1. 发明授权

US5175885A CRT update wideband double balanced mixer 失效
标题翻译： CRT更新宽带双平衡混音器
公开(公告)号：US5175885A
公开(公告)日：1992-12-29
申请号：US584560
申请日：1990-09-18
申请人： Julius Lange , Timothy Halloran
发明人： Julius Lange , Timothy Halloran
IPC分类号： H03D7/12 , H04B1/26
CPC分类号： H04B1/26 , H03D7/125
摘要： An improved wideband double balanced GaAs mixer is presented and includes a plurality of FETs which are operative to couple a plurality of input signals to a diode ring quad wherein the signals are mixed, producing output IF signals composing multiples of the sum and difference frequency of the alternating input signals. In a first embodiment, a first pair of FETs is coupled to an input RF signal, and a second pair of FETs is coupled to an input LO signal. The first pair of FETs is driven in phase by the RF signal, while the second pair of FETs is driven in push-pull by the LO signal. This second pair of FETs is operative to alternately switch opposite sides of the diode ring quad into a conductive state wherein the mixing of the RF and LO signals take place.
摘要翻译：提出了一种改进的宽带双平衡GaAs混频器，并且包括多个FET，其操作以将多个输入信号耦合到二极管环形四边形，其中信号被混合，产生组成输出IF信号的和频和差频的倍数的输出IF信号交替输入信号。在第一实施例中，第一对FET耦合到输入RF信号，并且第二对FET耦合到输入LO信号。第一对FET通过RF信号同相驱动，而第二对FET由推挽式LO信号驱动。该第二对FET可操作地将二极管环四极的相对侧交替地切换成导通状态，其中发生RF和LO信号的混合。

2. 发明授权

US5463355A Wideband vector modulator which combines outputs of a plurality of QPSK modulators 失效
公开(公告)号：US5463355A
公开(公告)日：1995-10-31
申请号：US275604
申请日：1994-07-15
申请人： Timothy Halloran
发明人： Timothy Halloran
IPC分类号： H04L5/06 , H04L27/20 , H04L27/36
CPC分类号： H04L5/06 , H04L27/2071
摘要： A vector modulator that sums outputs of a plurality of quadrature-phase-shift-key (QPSK) modulator elements, each controlled by two digital input signals and a single local oscillator. The local oscillator provides a periodic sinusoidal output signal, and the modulator elements process the periodic sinusoidal output signal and the digital input signals. The state of the respective digital input signals determines which of four phase states are present at the output of the QPSK modulator. A plurality of summing devices are coupled to outputs of the modulator elements, and one summing device provides an analog constellation output signal of the vector modulator. A plurality of attenuators are provided for amplitude weighting output signals from the plurality of modulator elements. The outputs of the modulator elements are summed under control of their two respective digital input signals and the local oscillator to convert the digital input signals into phase and amplitude shifted, periodic, analog signals comprising the analog constellation output signal. In a second embodiment, a power divider is coupled between the local oscillator and the plurality of modulator elements and a power combiner is used to combine the summed output signals derived from the modulator elements. The modulator elements may each be a GaAs microwave monolithic integrated circuit that includes a 90.degree. coupler followed by first and second input amplifiers for respectively receiving and amplifying the periodic sinusoidal signal derived from the local oscillator, and first and second data amplifiers for respectively receiving and amplifying I and Q data input signals to provide amplified I and Q data input signals. First and second mixers are respectively coupled to outputs of the respective input and data amplifiers for multiplying the amplified local oscillator signals with the I and Q data input signals. A summing device is coupled to respective outputs of the mixers for generating a modulated output signal of the modulator element.

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