W3013

Preliminary Data Sheet November 1998 W3013 Indirect Quadrature Modulator with Gain Control Features n n n n n n n n Description The W3013 is a monolithic integrated circuit that provides indirect, quadrature modulation of an RF carrier by I & Q baseband inputs. The function performed by the W3013 is particularly suited for handheld digital cellular and digital cordless telephones that operate between 800 MHz and 2.2 GHz. The circuit block diagram is shown below. From a single local-oscillator input (LO1), the phase shifter produces two LO signals with 90° phase separation and equal amplitude. The LO signals are fed to the in-phase (I) and quadrature (Q) double-balanced mixers. The resulting signals are summed and fed into an RF mixer where the frequency can be translated to over 2 GHz. Outputs between the summer and RF mixer are available for external filtering. Finally, the signal is amplified to provide a single-ended output. The ENB/APC input with a logic low allows the device to be put into a powerdown mode. Above the logic low threshold, the device enters a power control mode that provides a range of desired output power levels. Low-voltage operation: 2.7 V High-frequency operation: 2.2 GHz High RF output power: –10 dBm High-accuracy phase shifter, no trim required Low carrier feedthrough: –45 dBc Automatic power control (APC) capability Low-current sleep mode 20-pin TSSOP package Applications n n n n n n North American IS-136 Japan PDC (RCR STD 27) Japan PHS (RCR S...