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    • 1. 发明授权
    • Low power dual sampler utilizing step recovery diodes (SRDS)
    • 低功率双采样器利用步进恢复二极管(SRDS)
    • US5708377A
    • 1998-01-13
    • US606380
    • 1996-02-23
    • Donald A. Bradley
    • Donald A. Bradley
    • H03D3/28H03D9/06H03K3/33G11C27/02
    • H03K3/33H03D9/0608H03D3/28
    • A low power dual sampler including two sampler switches with a step recovery diode (SRD) in each sampler switch. A local oscillator (LO) signal is provided through a power amplifier and transformer to baluns in the sampler switches without utilizing a power splitter, providing limited power loss to each balun. Each balun is configured to provide the LO signal to terminals of the SRD in a sampler switch without providing a termination to SRD impulses. Each sampler switch further includes series diodes connected across the terminals of each SRD switch with a junction of the series diodes connected to receive an RF signal, and the terminals of each SRD connected for providing an IF signal. To limit phase shift between SRD impulses, a temperature compensation circuit provides a DC offset voltage to each SRD. In one embodiment, each temperature compensation circuit includes an operational amplifier having a noninverting terminal coupled to a terminal of an SRD, an inverting terminal connected by a first resistor to ground, and an output connected by a second resistor to the inverting terminal and by a third resistor to the non-inverting terminal. To provide isolation between the sampler switches, a capacitor providing a high impedance to the LO signal and a low impedance to RF signals is connected at the interconnection of the sampler switches.
    • 一个低功率双采样器,包括两个采样器开关,每个采样器开关带有一个阶跃恢复二极管(SRD)。 通过功率放大器和变压器将本地振荡器(LO)信号提供给采样器开关中的巴伦,而不使用功率分配器,为每个平衡 - 不平衡变压器提供有限的功率损耗。 每个平衡 - 不平衡转换器被配置为向采样器开关中的SRD的端子提供LO信号,而不向SRD脉冲提供终止。 每个采样器开关还包括连接在每个SRD开关的端子之间的串联二极管,其中串联二极管的接点连接以接收RF信号,并且每个SRD的端子用于提供IF信号。 为了限制SRD脉冲之间的相移,温度补偿电路为每个SRD提供DC偏移电压。 在一个实施例中,每个温度补偿电路包括运算放大器,其具有耦合到SRD的端子的非反相端子,由第一电阻器接地连接的反相端子以及由第二电阻器连接到反相端子的输出端以及由 第三个电阻到同相端子。 为了在采样器开关之间提供隔离,在采样器开关的互连处连接向LO信号提供高阻抗的电容器和RF信号的低阻抗。