A predistortion technique has been proposed to reduce intermodulation distortion (IMD) generated from the conversion process of a mixer. In this technique, the IMD generated from a mixer in the IF band was cancelled by the controlled RF error signal, which is generated by a predistorter. The magnitude and phase of the RF error signal were properly adjusted through a vector modulator. This linearization technique has been verified by experiment of a down conversion mixer in the cellular band. A two tone test has been performed at the frequency of 836 MHz with 442 kHz separation. The results show that this method improves about 16 dB of IMD3 at -18 dBm IF output power in 10 MHz frequency band and increases about 3.5 dB of P1 dB of the mixer. Simple topology and good performance in linearization of IF signals renders this technique suitable for highly linear frequency conversion in communication systems.
[1]
T.J. Ellis.
A modified feed-forward technique for mixer linearization
,
1998,
1998 IEEE MTT-S International Microwave Symposium Digest (Cat. No.98CH36192).
[2]
I. D. Robertson,et al.
Linearised microwave mixer using simplified feedforward technique
,
1999
.
[3]
B. Gilbert,et al.
The MICROMIXER: a highly linear variant of the Gilbert mixer using a bisymmetric Class-AB input stage
,
1997,
IEEE J. Solid State Circuits.
[4]
J. S. Kenney,et al.
DESIGN CONSIDERATIONS FOR MULTICARRIER CDMA BASE STATION POWER AMPLIFIERS
,
1999
.
[5]
Youngoo Yang,et al.
Analog predistortion linearizer for high-power RF amplifiers
,
2000,
IMS 2000.