Patent ID: 8971835
Filing Date: 2015-03-03
Classification: H03D

Abstract:
1. A circuit, comprising: a transceiver chain having an antenna port configured to couple to an antenna for transmission or reception of a radio frequency (RF) signal; a first DC current source coupled to a first circuit node located within a first voltage domain of the transceiver chain, wherein the first voltage domain is defined as a difference between a first high DC supply voltage and a first low DC supply voltage employed for one or more circuits within the first voltage domain; and a second DC current source coupled to a second circuit node located within a second voltage domain of the transceiver chain at a position downstream of the first circuit node, wherein the second voltage domain is defined as a difference between a second high DC supply voltage and a second low DC supply voltage employed for one or more circuits within the second voltage domain, and wherein the first voltage domain and the second voltage domain are different; wherein the first and second DC current sources are configured to generate a DC cancellation current configured to cancel an unwanted DC current between the first circuit node and the second circuit node that is due to a potential difference between the first voltage domain and the second voltage domain.