PDF Solutions, Inc. is a provider of infrastructure technologies and services for integrated circuits (IC). The Company's technologies and services focus on the IC manufacturing process life cycle. It operates in the segment of licensing and implementation of yield improvement solutions for integrated circuit manufacturers. The Company's solutions combine software, test chips, an electrical wafer test system, methodologies and professional services. The Company has developed solutions for yield simulation, analysis, loss detection, and improvement. Its characterization vehicle infrastructure (CVi) enables customers to electrically characterize the manufacturing process, and establish fail-rate information needed to calibrate manufacturing yield models and prioritize yield improvement activities. Its Exensio YieldAware solution combines software and services to enable customers to collect and combine product test data and equipment signals during production.