US 7,890,063 B2 · Systems, methods, and apparatuses for complementary metal oxide semiconductor (CMOS) antenna switches using body switching in multistacking structure

Abstract

Embodiments of the invention may provide for a CMOS antenna switch, which may be referred to as a CMOS SP4T switch. The CMOS antenna switch may operate at a plurality of frequencies, perhaps around 900 MHz and 1.9 GHz according to an embodiment of the invention. The CMOS antenna switch may include both a receiver switch and a transmit switch. The receiver switch may utilize a multi-stack transistor with body substrate tuning to block high power signals from the transmit path as well as to maintain low insertion loss at the receiver path. On the other hand, in the transmit switch, a body substrate tuning technique may be applied to maintain high power delivery to the antenna. Example embodiments of the CMOS antenna switch may provide for 31 dBm P 1 dB at both bands (e.g., 900 MHz and 1.8 GHz). In addition, a 0.9 dB and −1.1 dB insertion loss at 900 MHz and 1.9 GHz, respectively, may be obtained according to example embodiments of the invention.

Claims18

Dependent claims

A CMOS antenna switch, comprising:

a transmit switch in communication with an antenna operative at a plurality of radio frequency (RF) bands;
a receiver switch in communication with the antenna, wherein the receiver switch comprises a plurality of stacked transistors to provide a receive signal path, the plurality of stacked transistors including a first transistor having a body substrate;
and
at least one body switch, wherein the at least one body switch is configured to selectively connect the body substrate to either a resistance or ground,
wherein when the transmit switch is enabled, the at least one body switch connects the body substrate of the first transistor to ground, thereby reducing leakage current in the receive signal path,
wherein when the receiver switch is enabled, the at least one body switch connects the body substrate of the first transistor to the resistance, thereby reducing an insertion loss of the receive signal path.

3 more elements

Dependencies are inferred from the claim text.

Systems, methods, and apparatuses for complementary metal oxide semiconductor (CMOS) antenna switches using body switching in multistacking structure

Life of this patent

Systems, methods, and apparatuses for complementary metal oxide semiconductor (CMOS) antenna switches using body switching in multistacking structure

Life of this patent

Abstract

Claims18