High Accuracy Envelope Tracking for LTE Smartphones and Modems

Nujira’s Coolteq.L Envelope Tracking Power Amplifier (PA) power supply modulators provide a high performance,high efficiency alternative to Buck-Boost switching DC/DC converters in 3G/4G user equipment.

Coolteq.L tracks the transceiver RF signal envelope and dynamically modulates the PA supply rail with high tracking accuracy. Nujira’s ISOGAIN™ envelope shaping linearizes the PA while keeping the device in a highly efficient compressed state across a wide power control range. Coolteq.L provides maximum benefit for high PAPR signals such as HSUPA and LTE.

Coolteq.L uses a high bandwidth three stage current supply, control and ripple elimination architecture to efficiently deliver power to the PA while meeting stringent system noise requirements.

Available in a low profile WLCSP package, Coolteq.L can be easily integrated as a standalone IC or within an RF Front End or PA module.

Features:

• 3G/4G high performance Envelope Tracking modulator for terminals
• Supports all LTE 3GPP bands
• ISOGAIN™ feed-forward PA linearization
• Fast disable/enable for TD-LTE
• Products for 5MHz, 10MHz & 20MHz channel bandwidths
• MIPI RFFE controlled operating modes for ET, Average Power Tracking, Bypass and Standby
• Industry-standard OpenET Analog Envelope Interface
• 0.5V to 5.0V output with Buck-Boost capability
• High Efficiency / Wide Bandwidth / Ultra LowNoise Solution