AN914| Application Note
Maxim > App Notes > WIRELESS, RF, AND CABLE Keywords: W-CDMA, upconverter, driver, 570MHz IF, WCDMA, intermediate frequency, 570 mhz, UMTS, IMT2000, IMT2000, ARIB, 570mhz if
May 01, 2002
APPLICATION NOTE 914
W-CDMA Upconverter/Driver Eliminates SAW Filter (Supports 570MHz IF)
Abstract: The MAX2383 was originally characterized with an intermediate frequency (IF) of 380MHz. This application note demonstrates the components required and the performance achievable with an IF of 570MHz. A complete application circuit and performance curves for output power, ACPR, gain, etc., over temperature and frequency are provided. Additional Information:
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Wireless Product Line Page MAX2383 MAX2391 MAX2394/MAX2395 Block Diagram for TDD-WCDMA Application Applications Technical Support
The MAX2383 upconverter and PA driver is designed for W-CDMA (wideband-code division multiple access) applications in Japan (ARIB) and Europe (ETSI-UMTS) over the IMT-2000 frequency band. The device includes an upconversion mixer with variable gain control and local oscillator (LO) buffer, as well as a variable-gain PA driver. The upconverter features greater than 30dB of gain control range to support automatic gain control (AGC) loops. In addition, the MAX2383 automatically decreases PA driver and mixer supply current as the output power is reduced. The MAX2383 was originally characterized with an intermediate frequency (IF) of 380MHz. This application note demonstrates the components required and the performance achievable with an IF of 570MHz. Figures 1 through 6 demonstrate the performance of the MAX2383 over temperature, frequency and supply variations. All tests targeted achieving the maximum output power, while meeting adjacent channel adjacent channel power ratio (ACPR) requirements of -46dBc.
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