This paper investigates the design of practical receivers for simultaneous wireless information and power transfer (SWIPT). The authors propose a general receiver operation called dynamic power splitting (DPS), which dynamically splits the received signal into two streams with adjustable power ratio for energy harvesting and information decoding. Three special cases of DPS, namely time switching (TS), static power splitting (SPS), and on-off power splitting (OPS), are analyzed. The TS and SPS schemes are treated as special cases of OPS. Two types of practical receiver architectures are proposed: separated and integrated information and energy receivers. The integrated receiver integrates the front-end components of the separated receiver, achieving a smaller form factor. The rate-energy tradeoff for the two architectures is characterized by a rate-energy (R-E) region. The optimal transmission strategy is derived to achieve different rate-energy tradeoffs. With receiver circuit power consumption taken into account, it is shown that the OPS scheme is optimal for both receivers. For the ideal case when the receiver circuit does not consume power, the SPS scheme is optimal for both receivers. The performance of the two types of receivers is studied under a realistic system setup that employs practical modulation. The results provide useful insights for the optimal practical receiver design for SWIPT.This paper investigates the design of practical receivers for simultaneous wireless information and power transfer (SWIPT). The authors propose a general receiver operation called dynamic power splitting (DPS), which dynamically splits the received signal into two streams with adjustable power ratio for energy harvesting and information decoding. Three special cases of DPS, namely time switching (TS), static power splitting (SPS), and on-off power splitting (OPS), are analyzed. The TS and SPS schemes are treated as special cases of OPS. Two types of practical receiver architectures are proposed: separated and integrated information and energy receivers. The integrated receiver integrates the front-end components of the separated receiver, achieving a smaller form factor. The rate-energy tradeoff for the two architectures is characterized by a rate-energy (R-E) region. The optimal transmission strategy is derived to achieve different rate-energy tradeoffs. With receiver circuit power consumption taken into account, it is shown that the OPS scheme is optimal for both receivers. For the ideal case when the receiver circuit does not consume power, the SPS scheme is optimal for both receivers. The performance of the two types of receivers is studied under a realistic system setup that employs practical modulation. The results provide useful insights for the optimal practical receiver design for SWIPT.