A compact analog baseband for the millimeter-wave radar receiver is implemented on a 28 nm CMOS(Complementary Metal Oxide Semiconductor)process.The circuit consists of a three-stage programmable gain amplifier which is embedded with DCOC(DC Offset Cancellation)loops and a sixth-order Butterworth low-pass filter,enabling reconfigurable gain and bandwidth.Reusable resistor and capacitor arrays are used in the analog baseband,and transistors operating in the subthreshold region are introduced as active resistors into the DCOC loops,which significantly reduce the chip area.The measurement results show that the analog baseband with an area of 0.01 mm2 provides a gain range of-0.6 to 68.4 dB with a gain step of 5.8 dB,and a bandwidth adjustment range of 500 kHz to 17 MHz.It achieves an output third-order intercept point of 22.4 dBm and consumes a power of 12 mW from a 1.8 V supply voltage.
关键词
模拟基带/可编程增益放大器/低通滤波器/DCOC/小型化
Key words
analog baseband/programmable gain amplifier/low-pass filter/DCOC/miniaturization
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