A 3^rd/5^th Order Active RC Chebyshev Analog Baseband Low-Pass Filter With Reconfigurable Bandwidth and Gain

Abstract

The design of 3rd/5th order active RC Chebyshev low-pass filter (LPF) with reconfigurable bandwidth and gain is based on 55 nm CMOS technology. The filter is integrated into draft IEEE $802.11{\mathrm {a}}\times$ concurrent dual band four antenna transceiver analog baseband circuit. Programmable capacitor bank of the filter is used to adjust bandwidth. The typical bandwidth of receiving filter is 10/20/40 MHz, and that of transmitting filter is 12/24/50 MHz. Adjust the gain ranging from −10 to 18 dB in passband by programmable resistor bank. The current consumption of typical bandwidth of receiving filter is 2.08 mA at a 1.5 V supply and has properties of 10 MHz bandwidth (BW), 36 dB gain, −62 dBm input signal, −39 dB third intermodulation distortion (IMD3), 17.1 nV/ $\surd $ Hz equivalent input noise (EIN). As for transmitting filter, the current consumption of typical bandwidth is 1.25 mA at a 1.5 V supply and has the properties of 10 MHz BW, −6 dB gain, 0 dBm input signal, −38 dB IMD3, 75 nV/ $\surd $ Hz EIN. Area of the whole filter is 0.08 mm2.

Keywords

• Active RC
• analog baseband
• low-pass filter