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为使可拆式移动电台小型化、低功耗化,用双极和 CMOS 工艺研制了高频缓冲放大器 IC 及调制解调基带大规模集成电路(LSI)。缓冲放大器 IC 由二部分组成,一部分是缓冲放大器,它把压控振荡器输出分配给收发混频器和前置分频器:另一部分是1/2分频器,用在共射单位放大电路的级间插入衰减器的结构,提高压控振荡器和收发混频器的隔离度。调制解调基带大规模集成电路则用模拟、数字混合 CMOS 技术把145MHz 直接调频锁相环(PLL)电路、调制解调信号用的各种滤波器及限幅电路集成在一块芯片上。采用电容分压型开关电容滤波器及开关电容型限幅器设计,得到了高精度的滤波器及限幅器特性。由于使用了这些 LSI,和现用 TZ-802型移动电台电路相比,体积缩小了40%,功耗降低了25%。
In order to miniaturize and reduce the power consumption of a removable mobile station, a high-frequency buffer amplifier IC and a modulation and demodulation baseband LSI are developed using a bipolar and CMOS process. The buffer amplifier IC consists of two parts, one is the buffer amplifier, which distributes the voltage-controlled oscillator output to the transmit-receive mixer and the prescaler: the other is the 1/2 divider, which is used in the common-unit amplification circuit Interstage insertion attenuator structure, improve the voltage-controlled oscillator and the transceiver mixer isolation. Modem baseband LSI uses analog and digital hybrid CMOS technology to integrate a 145MHz direct-coupled phase-locked loop (PLL) circuit, various filters and limiter circuits for modem signals into a single chip. The use of capacitive voltage divider-type switched capacitor filter and the design of switched-capacitor limiter, get a high-precision filter and limiter characteristics. Due to the use of these LSIs, they are 40% smaller and consume 25% less power than existing TZ-802 mobile radio circuits.