W3013

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability.

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.