Nujira’s Woodstock 16-band multimode, multiband (MMMB) envelope tracking (ET) reference design targets 4G smart-phone RF front ends. Using the company’s NCT-L1200 ET chip, it overcomes the energy efficiency and frequency band challenges faced by mobile operators and handset OEMs since the introduction of 4G, according to the company.
Covering up to 16 frequency bands from 700 MHz to 2.7 GHz in a printed-circuit board (PCB) area of less than 200 mm2, the reference design delivers state-of-the-art multiband 2G, 3G, and 4G performance using less PCB area and battery power than today’s 3G smart phones, according to Nujira.
Incorporating an MMMB ET power amplifier (PA), a broadband 2.3- to 2.7-GHz ET PA, and an additional region- or operator-specific LTE ET PA, the reference design ensures maximum frequency band coverage and energy efficiency at minimal costs, the company says. By enabling handsets to operate on almost all worldwide 3G and 4G bands, it’s designed to significantly reduce the need for numerous regional product variants.
The Woodstock design integrates the NCT-L1200 ET supply modulator with PA devices, switches, and filters from a number of Tier 1 suppliers to provide a complete solution from transceiver to antenna. The ET modulator also enables the handset to deliver full power to the antenna port to maximize coverage and boost data rates, even for LTE signals with high peak-to-average power ratios, eliminating the need for maximum power reduction.
The NCT-L1200 also boasts the industry’s lowest output impedance, according to the company, enabling it to drive up to four PA devices in parallel without compromising performance even on the highest-bandwidth 20-MHz LTE channels while cutting energy consumption by 35%. The design also includes several patented PCB and component-level innovations to maximize system performance.