# US 2014/0192908 A1 · Parallel hybrid circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192908 A1 - Document ID: US20140192908A1 - Status: Published application - Kind: A1 - Application number: 13/922,238 - Filed: 2013-06-19 - Published: 2014-07-10 - Earliest claimed: 2013-01-09 - Assignees: Mediatek Inc. - Applicants: Mediatek Inc. - Inventors: Yu-Lin Chu; Hsin-Hsien Li; Shih-Jen Li; Li-Yu Chiu; Bing-Hsun Lu - Web page: https://patentgrep.com/patent/US20140192908A1 ## CPC - H04B 1/581: {using a transformer} - H04B: TRANSMISSION ## Abstract A parallel hybrid circuit comprising a transformer, a first matching resistor, a second matching resistor and an echo cancelling circuit. The transformer comprises: a first side, comprising a transmitting coil group and a receiving coil group, wherein the transmitting coil group comprises at least one transmitting coil, wherein the receiving coil group comprises at least one receiving coil; a second side comprising at least one transceiving coil; wherein the transformer receives a transmitting signal and couples the transmitting signal from the first side to the second side via a first turn ratio, and receives a receiving signal from the transceiving line and couples the receiving signal from the second side to the first side via a second turn ratio. The first, second matching resistors are coupled with the transformer in parallel. The echo cancelling circuit is coupled between the transmitting line and the receiving line. ## Claims ### Claim 1 A parallel hybrid circuit, comprising: a transformer, comprising: a first side, comprising a transmitting coil group and a receiving coil group, wherein the transmitting coil group comprises at least one transmitting coil respectively having a transmitting coil number cnt, wherein the receiving coil group comprises at least one receiving coil respectively having a receiving coil number cnr a second side comprising at least one transceiving coil having a transceiving coil number cntr; wherein the transformer receives a transmitting signal from at least one transmitting line and couples the transmitting signal from the first side to the second side via a first turn ratio to generate a transformed transmitting signal to at least one transceiving line, and receives a receiving signal from the transceiving line and couples the receiving signal from the second side to the first side via a second turn ratio to generate a transformed receiving signal to at least one receiving line; where the first turn ratio is relative to the cnt and the cntr, and the second turn ratio is relative to the cntr and the cnr; a first matching resistor, coupled with the transformer in parallel; a second matching resistor, coupled with the transformer in parallel; and an echo cancelling circuit coupled between the transmitting line and the receiving line. ### Claim 2 (depends on 1) The parallel hybrid circuit of claim 1, wherein the transmitting coil group comprises a first transmitting coil and a second transmitting coil, the receiving coil group comprises a first receiving coil and a second receiving coil; where the first transmitting coil, the second transmitting coil the first receiving coil, and the second receiving coil respectively have a first terminal having a first polarity and a second terminal having a second polarity; wherein the first terminal of the first transmitting coil is coupled to the second terminal of the first receiving coil, and the second terminal of the second transmitting coil is coupled to the first terminal of the second receiving coil; wherein a first terminal of the first matching resistor is coupled to the second terminal of the first transmitting coil, and a second terminal of the first matching resistor is coupled to the second terminal of the second transmitting coil; and wherein a first terminal of the second matching resistor is coupled to the first terminal of the second transmitting coil, and a second terminal of the second matching resistor is coupled to the first terminal of the first transmitting coil. ### Claim 3 (depends on 2) The parallel hybrid circuit of claim 2, wherein the echo cancelling circuit comprises: a first resistance device, having a first terminal coupled to the second terminal of the first matching resistor; a second resistance device, having a first terminal coupled to the first terminal of the first receiving coil, and having a second terminal coupled to a second terminal of the first resistance device; a third resistance device, having a first terminal coupled to the second terminal of the second matching resistor; a fourth resistance device, having a first terminal coupled to the second terminal of the second receiving coil, and having a second terminal coupled to a second terminal of the third resistance device. ### Claim 4 (depends on 1) The parallel hybrid circuit of claim 1, wherein the transmitting coil group comprises a first transmitting coil and a second transmitting coil, the receiving coil group comprises a first receiving coil and a second receiving coil; where the first transmitting coil, the second transmitting coil the first receiving coil, and the second receiving coil respectively have a first terminal having a first polarity and a second terminal having a second polarity; wherein the first terminal of the first transmitting coil is coupled to the first terminal of the first receiving coil, and the second terminal of the second transmitting coil is coupled to the second terminal of the second receiving coil; where a first terminal of the first matching resistor is coupled to the second terminal of the first transmitting coil, and a second terminal of the first matching resistor is coupled to the second terminal of the second transmitting coil; and wherein a first terminal of the second matching resistor is coupled to the first terminal of the second transmitting coil, and a second terminal of the second matching resistor is coupled to the first terminal of the first transmitting coil. ### Claim 5 (depends on 4) The parallel hybrid circuit of claim 4, wherein the echo cancelling circuit comprises: a first resistance device, having a first terminal coupled to the second terminal of the second matching resistor; a second resistance device, having a first terminal coupled to the second terminal of the first receiving coil, and having a second terminal coupled to a second terminal of the first resistance device; a third resistance device, having a first terminal coupled to the second terminal of the first matching resistor; a fourth resistance device, having a first terminal coupled to the first terminal of the second receiving coil, and having a second terminal coupled to a second terminal of the third resistance device. ### Claim 6 (depends on 1) The parallel hybrid circuit of claim 1, wherein the transmitting coil group comprises a first transmitting coil and a second transmitting coil, the receiving coil group comprises a first receiving coil and a second receiving coil; where the first transmitting coil, the second transmitting coil the first receiving coil, and the second receiving coil respectively have a first terminal having a first polarity and a second terminal having a second polarity; wherein the first terminal of the first receiving coil is coupled to the second terminal of the first transmitting coil, and the second terminal of the second receiving coil is coupled to the first terminal of the second transmitting coil; where a first terminal of the first matching resistor is coupled to the second terminal of the first transmitting coil, and a second terminal of the first matching resistor is coupled to the second terminal of the second transmitting coil; and wherein a first terminal of the second matching resistor is coupled to the first terminal of the second transmitting coil, and a second terminal of the second matching resistor is coupled to the first terminal of the first transmitting coil. ### Claim 7 (depends on 6) The parallel hybrid circuit of claim 6, wherein the echo cancelling circuit comprises: a first resistance device, having a first terminal coupled to the second terminal of the first receiving coil; a second resistance device, having a first terminal coupled to the second terminal of the second matching resistor, and having a second terminal coupled to a second terminal of the first resistance device; a third resistance device, having a first terminal coupled to the first terminal of the second receiving coil; a fourth resistance device, having a first terminal coupled to the second terminal of the first matching resistor, and having a second terminal coupled to a second terminal of the third resistance device. ### Claim 8 (depends on 1) The parallel hybrid circuit of claim 1, wherein the first turn ratio equals to cnt:cntr and the second turn ratio equals to cntr:cnr. ### Claim 9 (depends on 1) The parallel hybrid circuit of claim 1, wherein the first turn ratio equals to cnt:cntr and the second turn ratio equals to cntr:cnt+cnr. ### Claim 10 (depends on 1) The parallel hybrid circuit of claim 1, wherein an echo turn ratio of the parallel hybrid circuit is cnt:cnr. ### Claim 11 (depends on 1) The parallel hybrid circuit of claim 1, wherein an echo turn ratio of the parallel hybrid circuit is cnt:cnr−1. ### Claim 12 (depends on 1) The parallel hybrid circuit of claim 1, wherein an echo turn ratio of the parallel hybrid circuit is cnr:cnt.