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Low noise, Active Phase Inverter with Power Gain and Tunable Output Phase

IP.com Disclosure Number: IPCOM000236093D
Publication Date: 2014-Apr-04
Document File: 2 page(s) / 98K

Publishing Venue

The IP.com Prior Art Database

Abstract

Traditional phase inverters are realized with passive baluns and active switching stages. The noise figure of the design is comparable with the loss of the passive balun NF~L. Pasive baluns at mm-Waves have losses in the order of 4-5dB. Adding a switching stage will increase NF to above 10dB. In a phased-array transceiver with RF power combining and RF phase shifting the loss of the phase shifter degrades the NF of the receiver and the output power at the transmitter. In both situations, a phase inverter with gain and low NF will improve the link budget (increase the Rx sensitivity and increase of RF transmit power). This disclosure proposes an active phase inverter with power gain, low noise figure and tunable phase. The phase control range is +/- 4° around 180° with an absolute precision of 0.16°

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Low noise,

Active Phase Inverter with Power Gain and Tunable Output Phase

Active Phase Inverter with Power Gain and Tunable Output Phase

Traditional phase inverters are realized with passive baluns and active switching stages. The noise figure of the design is comparable with the loss of the passive balun NF~L. Pasive baluns at mm Waves have losses in the order of 4 5dB. Adding a switching stage will increase NF to above 10dB. In a phased array transceiver with RF power combining and RF phase shifting the loss of the phase shifter degrades the NF of the receiver and the output power at the transmitter. In both situations, a phase inverter with gain and low NF will improve the link budget (increase the Rx sensitivity and increase of RF transmit power). This disclosure proposes an active phase inverter with power gain, low noise figure and tunable phase. The phase control range is +/ 4° around 180° with an absolute precision of 0.16°

This disclosure proposes an active phase inverter with power gain, low noise figure and fine adjustable phase. It provides two possible phases: 0 degree and 180 degree. The 180 degree can be adjusted with an absolute precision of 0.16 degree and the phase adjustment range is +/ 5 degree around 180 degree. The phase inverter is followed by a phase shifter that can provide an extra 180 degree in order to get a complete 360 degree phase shifter. Known solutions rely on passive components as such as baluns or hybrids for providing the two phases. On chip baluns have large loss at mm Waves and the phase error can be in the order of 10 degree if large bandwidth is required. Their phase is not adjustable and the total noise figure NF is comparable to their insertion loss. When using them in a phased array system, at the receiver side, the sensitivity of the receiver is impaired (total receiver will have larger noise figure). At the transmitter side, the the loss of the phase inverter will reduce the total output power at the antenna. The present solution circumvents those drawbacks by providing an adjustable phase inverter with power gain and low noise figure.

The proposed solution consists of an active balun, a switching stage and a phase shifter with phase fine tuning. The active balun has a tunable load (using a tunable Tline) for equating the amplitudes of the two signals present at its output. The two signals have opposite phase. The first stage and the switching stage provide power gain. Therefore, the total phase inverter has power gain and low noise figure. Another feature is the phase adjustment for mitigating the effects of process variation and phase dependency on frequency. By this one can obtain two signals with opposite phase with a precision of...