A 1-to-4 Channel Receiver for WCDMA Base-Station Applications

Low-noise amplifiers for WCDMA base-station receivers

“…Both the designed LNAs are implemented as a part of a WCDMA multicarrier receiver, which were fabricated in STMicroelectronics 0.25-lm SiGe BiCMOS process [1]- [2]. The supply voltage is 2.5 V. In Fig.…”

“…3 [2]. In this design, two different gain modes have been implemented by using a single programmable core.…”

“…In this paper, two different alternatives to implement an LNA for WCDMA base-station receivers are described. The LNA, which is often the most important block when pursuing high performance, is implemented as a part of a whole receiver, which includes quadrature mixers, frequency divider for local oscillator signal, low pass active baseband filters, and buffer amplifiers for an analog-to-digital converter [1], [2]. The simplified block diagram of the complete receiver is shown in Fig.…”

Broadband Direct RF Digitization Receivers

“… Up to 4 contiguous WCDMA channels are simultaneously received by an RF front-end in [42]. It operates over the RF band 1.7-2 GHz.…”

Programmable SiGe BiCMOS low-pass filter for a multicarrier WCDMA base-station receiver

“…By using a single multicarrier IC that does not need parallel blocks, the size and cost of the BS can be reduced [1,2]. However, since the number of adjacent channels allocated for different operators can vary, it would be advantageous if a single IC could be used to receive different number of channels [3]. In order to keep the requirements of the analog-to-digital converter (ADC) constant, the out-of-band blocking and interfering signals should be attenuated similarly in the low-pass filter (LPF) regardless of the number of the received channels.…”