A direct conversion transceiver for multi-band GSM application

The use of direct conversion receiver topologies has been marked by many technical problems, particularly when used in a TDMA environment. This paper describes a receiver architecture that overcomes many of the traditional problems associated with direct conversion. This architecture has been applied in the design of a GSM multi-band transceiver that also features a development of the offset PLL transmitter together with a fast locking fractional-N synthesizer.