29-04-2014, 04:29 PM
A RF Frong-End CMOS Transceiver for 2GHz Dual-Band Applications
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Abstract
This paper describes RF front-end
transceiver chipset for the dual-mode operation of
PCS-Korea and IMT-2000. The transceiver chipset
has been implemented in a 0.25μm single-poly five-
metal CMOS technology. The receiver IC consists of
a LNA and a down-mixer, and the transmitter IC
integrates an up-mixer. Measurements show that the
transceiver chipset covers the wide RF range from
1.8GHz for PCS-Korea to 2.1GHz for IMT-2000. The
LNA has 2.8~3.1dB NF, 14~13dB gain and 5~4dBm
IIP3. The down mixer has 15.5~16.0dB NF, 15~13dB
power conversion gain and 2~0dBm IIP3. The up
mixer has 0~-2dB power conversion gain and
6~3dBm OIP3. With a single 3.0V power supply, the
LNA, down-mixer, and up-mixer consume 6mA,
30mA, and 25mA, respectively.
INTRODUCTION
In the near future, as third-generation wireless systems
are launched, there will be an increasing demand for multi-
band capabilities [1], [2]. It is desirable to combine two or
more standards in one mobile unit for overall capacity
enlargement, higher flexibility, and roaming capability as
well as backward compatibility. Moreover, multi-standard
transceivers will allow access to different systems providing
various services [3], [4]. These are the cause of the
instigation for the multi-band multi-mode operation.
This paper presents the design and implementation of
a pair of dual-band CMOS RF front-end transceiver ICs
for PCS-Korea and IMT-2000 standards. The optimal
multi-standard transceiver should be as simple and small
as possible. Hence, it would be advantageous if the
transceiver could share as many of its building blocks as
possible in all operation bands. The front-end transceiver
presented in this paper use its building blocks in
common in both bands. Section II describes the design of
the building blocks. Experimental results are presented
in Section III and the paper is summarized in Section IV.
Down-Conversion Mixer
The LNA output signal is filtered by a LC band pass
filter and down converted to IF frequency by the down
mixer shown in Fig. 3. The down mixer must have
sufficient conversion gain with a minimal noise
contribution. Therefore, the down mixer was realized
with an active Gilbert cell multiplier. The down mixer
without the LO processing circuit has three-stage
configuration composed of a single to differential
amplifying balun, a double-balanced Gilbert cell mixer,
and an output driver.
CONCLUSION
We present the design and implementation of dual-
band CMOS RF front-end transceiver ICs for PCS-
Korea and IMT-2000 standards. Since the presented
transceiver shares its building blocks in both the
standards, it is as simple and small as possible. The
transceiver has been implemented in a standard 0.25μm
CMOS technology. The receiver IC consists of a LNA
and a down-mixer, and the transmitter IC integrates an
up-mixer. With a single 3.0V power supply, the LNA,
down-mixer and up-mixer consume 6mA, 30mA and
25mA, respectively. The overall measured performances
are summarized in table 1.