The National Institute of Standards and Technology (NIST) is seeking information on sources capable of providing a high-speed lock-in/servo system for its Photonic ac-dc Thermal Transfer Standard project, which aims to develop next-generation chip-scale metrology. The required system must meet specific technical specifications, including at least 4 analog inputs with 600 MHz bandwidth, a 1 GSa/s sampling rate, and capabilities such as lock-in amplification, PID control, and spectrum analysis. This is a combined sources sought notice and notice of intent to sole source to Liquid Instruments Inc., unless alternative sources are identified. No budget amount or performance location is specified in the description. No submission timeline is provided, but responses are requested as soon as possible before the notice’s closing date.