This paper describes a highly integrated CDMA 2000 US-CEL band receiver signal path functions including the LNA on a single die. The complete receiver design exceeds the stringent linearity and LO leakage requirements for this standard arising from the co-existence with narrow band FM signals. The integrated LNA achieves 1.0dB noise figure with +9dBm IIP3 at high gain, and by maintaining LO leakage to the antenna port well below -80dBm at all gain settings, no external LNA is required. The receiver is fabricated in a 0.25/spl mu/m 40 GHz ft BICMOS technology, and occupies 3mm/sup 2/.
A highly integrated transmit integrated circuit intended for dual-band (CELL/PCS) and triple-mode (CDMA/TDMA/AMPS) cellular mobile stations is presented. It features a linear-in-dB gain-control range of 90 dB and provides a high output power of 9 dBm (PCS band) while meeting linearity requirements (-53-dBc ACPR) and achieving the receive-band noise floor of -133 dBm/Hz. It consumes only 130-mA current (3-V supply) in the PCS band. A dynamic-biasing feature results in additional power savings at lower signal levels. The circuit is fabricated in a 30-GHz f/sub T/ BiCMOS technology.
This paper describes a low-power, high-performance WLAN 802.11 a/b/g radio transceiver optimized for mobile applications and co-existence with on-board cellular and Bluetooth systems. The direct conversion architecture is optimized to achieve uncompromised RF performance at low power. A key transceiver requirement is a sensitivity of -77dBm (at the LNA input) in the presence of a GSM 1900 transmitter interferer while in 54Mb/s OFDM mode. The receiver chain achieves a NF of 2.8/3.2dB, consuming 168/185mW at 2.8V for the 2.4/5GHz bands respectively. Signal loopback and transmit power detection techniques are used in conjunction with the baseband modem processor to calibrate the transmitter LO leakage and the transceiver I/Q imbalances. Fabricated in a 70GHz f/sub T/ 0.25/spl mu/m SiGe BiCMOS technology for system-in-package (SiP) use, the dual-band, tri-mode transceiver occupies only 4.6mm/sup 2/.
A direct up-conversion transmitter design for CEL and PCS band CDMA cellular radio is presented. Linear-in-dB power control gives reduced supply consumption at low output levels. Current from the 2.85 V supply is 68 mA at +8 dBm and 38 mA at minimum power including both TX and RX synthesizers and TX VCO.
We present a study of current mirror topologies for reference sources and PLL charge pumps, where the objective is to achieve excellent input to output DC matching over almost the whole available power supply range, while maintaining a very high output resistance. From the ideal requirements, we contrast existing designs and develop new topologies which come close to the ideal in terms of available range and resistance, by using regulation at the input as well as output. We consider noise, systematic and random and matching penalties in each circuit. It is shown that mirrors operating in the triode region exhibit lower random mismatch compared with the equivalent conventional mirrors. Measured results are presented from a 0.25 /spl mu/m 2.5 V CMOS test-chip.
This paper describes a high-performance WLAN 802.11a/b/g radio transceiver, optimized for low-power in mobile applications, and for co-existence with cellular and Bluetooth systems in the same terminal. The direct-conversion transceiver architecture is optimized in each mode for low-power operation without compromising the challenging RF performance targets. A key transceiver requirement is a sensitivity of -77 dBm (at the LNA input) in 54 Mb/s OFDM mode while in the presence of a GSM1900 transmitter interferer. The receiver chain achieves an overall noise figure of 2.8/3.2 dB, consuming 168/185 mW at 2.8 V for the 2.4/5GHz bands, respectively. Signal loopback and transmit power detection techniques are used in conjunction with the baseband modem processor to calibrate the transmitter LO leakage and the transceiver I/Q imbalances. Fabricated in a 70 GHz f T 0.25-mum SiGe BiCMOS technology for system-in-package (SiP) use, the dual-band, tri-mode transceiver occupies only 4.6 mm 2
This paper describes a highly integrated CDMA 2000 US-CEL band (880-MHz) receiver. The single-chip zero-IF design incorporates all receiver signal-path functions including the low-noise amplifier (LNA) on a single die. The complete receiver design exceeds the stringent linearity and local oscillator (LO) leakage requirements for this standard arising from the coexistence with narrow-band FM signals. The integrated LNA achieves 1.0-dB noise figure with +9-dBm IIP3 at high gain, and by maintaining LO leakage to the antenna port well below -80 dBm at all gain settings, no external LNA is required. The receiver is fabricated in a 0.25-/spl mu/m 40-GHz f/sub t/ BICMOS technology, and occupies 3 mm/sup 2/.
This paper describes a low power, high performance double conversion WiBro/WiMAX 802.16e radio transceiver optimized for mobile applications and coexistence with on-board cellular and WLAN/Bluetooth systems. It is fabricated in a SiGe BiCMOS process and achieves a receiver NF of less than 2.5 dB at an operation frequency of 2.35 GHz. The transmit gain can be digitally tuned over a 75 dB range. The transceiver consumes 125/135 mA at a 2.8 V supply in OFDMA Rx/Tx modes respectively
We present a dual-mode receiver for dual-band CDMA 2000 cellular radio, which incorporates an integrated GPS signal path for "E911" emergency call location requirements. The highly integrated zero-IF architecture has separate optimised front-ends, but employs a single shared, reconfigurable baseband path for the two signal bandwidths. The CDMA LO signals are derived from a single external VCO that operates at either twice or 8/9 times the LO frequency at 880 MHz and 1960 MHz respectively, thereby reducing coupling with the transmit path. The circuit is implemented in a 0.25 mum 40 GHz fT BiCMOS process. The chip area is 5 mm 2 ; the CDMA CEL/PCS and GPS receivers consume 108/131 mW and 157 mW respectively, using a 2.7 V supply.
A highly integrated transmit IC intended for dual-band (CELL/PCS) and triple-mode (CDMA/TDMA/AMPS) cellular mobile stations is presented. It features a linear-in-dB gain-control range of 90 dB and provides a high output power of 9 dBm (PCS band) while meeting linearity requirements (-53dBc ACPR), and achieving the receive-band noise floor of -133dBm/Hz.
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