Design of CMOS VHF/RF Biquadratic Filters
Analog Integrated Circuits and Signal Processing
A high performances CMOS CCII and high frequency applications
Analog Integrated Circuits and Signal Processing
The software radio architecture
IEEE Communications Magazine
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The various architectures of transceivers for current standards are firstly compared. Different possibilities to achieve multi-standard transceivers are also recalled and compared. We demonstrate that ease of realization and flexibility evolve in opposite directions. The advantages and drawbacks of reconfigurable active filters are indicated. We demonstrate that the second generation current controlled conveyor operating in current mode is perfectly suitable for the realization of frequency-agile filters. After a brief recall of the essential points of agile filters, a second order frequency agile bandpass filter operating in current mode is implemented with CCCII+ . It has four central frequencies whose values could be selected digitally. The validation results show that its tuning ratio n = f 0max/f 0min is equal to 5.1 with f 0max = 1.22 GHz.