Design and Implementation of Two Single-Balanced Mixers for a Bluetooth Transceiver

In this study, two different types of 90-degree hybrid mixers were designed and analyzed in an ISM (industrial, scientific, and medical) 2.4 GHz band. The first is a general type; the other, a low-distortion type. For the low-distortion type, the 1-dB compression point and the third interception point are increased about 3-dB. The proposed mixers have a major shortcoming with a significant penalty in board space on the 2.4 GHz frequency band. Both mixers have their own features and characteristics; hence, they can be chosen for Bluetooth applications.