An Integrated Two-Mode Tunable Channelized Low-Noise Active Filter

作者：Alahyari Amin; Dousti Massoud^*; Tavakoli Mohammad Bagher

来源：Journal of Circuits, Systems, and Computers, 2018, 27(6): 1850090.

DOI：10.1142/S0218126618500901

• Wideband amplifier
• channelized filter
• bandpass filter
• band-stop filter
• noise canceling

In this paper, a new structure for an integrated channelized active filter is proposed. This filter can be used as a channelized bandpass filter and again as a channelized band-stop filter. This is fulfilled by using one biasing voltage. In designing a three-channel bandpassfilter, a recursive differential structure is used. Moreover, by subtracting bandpass filter output from an all-pass output, the proposed three-channel band-stop filter is achieved. A wideband amplifier plays the role of an all-pass filter. In addition, to decrease the noise of this filter, a noise-canceling circuit is adopted. By using this circuit, input impedance matching is obtained simultaneously. The center frequencies of the two-mode channelized filter are 2, 4 and 6 GHz. In each of them, the center frequency is controlled via two biasing voltages. The maximum center frequency shift is 450 MHz. For designing the proposed circuit, GaAs 0.15 mu m technology is applied. The occupied area is 2.5 x 2.6 mm(2).

• 出版日期2018-6-15