TransSiP has developed a new approach to noise reduction and switching noise jitter (SNJ) conditioning in switching DC-DC power conversion. Using cutting-edge real-time spectrum analysis techniques that reveal signal details invisible to conventional spectrum and vector signal analyzers, TransSiP's innovative DC-DC conversion circuit topology is applicable to a broad range of applications and compatible with system-in-package devices. This patent-pending design and methodology addresses the critical needs of noise-sensitive microsystems at the heart of portable, wearable, and IoT/M2M wireless communications and navigation for clean power and high conversion efficiencies in both full and standby power modes.


Seeing is Believing...

The well-known components of PFM supply bias noise:

  • Output voltage ripple
  • Harmonics of switching frequency/frequencies
  • Ringing (due to parasitics)
  • Spurious or transient events

can be filtered and suppressed, although the variable frequency of PFM switched-mode converters can make this problematic. However, once ripple and noise on the supply bias is attenuated, TransSiP has found that noise amplitude is no longer the dominant factor.
Real-time spectrum analysis provided the answer: there are very short, varying interval transient and spurious events associated with a time domain component. This component, which TransSiP has termed “SNJ” (switching noise jitter) is what causes the chaotic noise signatures that compromise powered system performance.
Read Tektronix’ case study here.


A New Approach

The insights provided by DPX® analysis and mathematical modelling led to the development of a new filtering concept for switched-mode PFM-type DC-DC converters. This new circuit topology can be implemented in the form of a discrete SiP component on the output of a PFM DC-DC converter, as a component set on a system motherboard, or as a complete DC-DC conversion solution: TransSiP's JC-PFM™