Load-dependent power transfer efficiency for on-chip coils

Abstract This paper presents a theory for the power transfer efficiency of printed circuit board coils to integrated coils, with focus on load-dependence low-power single-chip systems. The is verified electromagnetic simulations modelled 350 nm CMOS process which in turn are by measurements manufactured circuits. evaluated on-chip rectification 151 MHz signal transmitted spiral coil at 10 mm separation an coil. Such approach avoids influence off-chip parasitic elements such as bond wires, would reduce accuracy evaluation. It found that there lower limit load below reducing consumption circuits yield no increase voltage generated load. For examined technology, this appears lie around 56 k $$\Omega$$ Ω . focused analysis and verification behind limit. We relate results presented work application wireless temperature monitoring semiconductors conclude system be compatible