Volterra Semiconductor (Nasdaq: VLTR) is expected to report Q4 earnings on Jan. 22. Here's what Wall Street wants to see:

The 10-second takeaway
 Comparing the upcoming quarter to the prior-year quarter, average analyst estimates predict Volterra Semiconductor's revenues will grow 1.6% and EPS will decrease -13.3%.

The average estimate for revenue is $39.4 million. On the bottom line, the average EPS estimate is $0.26.

Revenue details
 Last quarter, Volterra Semiconductor reported revenue of $42.1 million. GAAP reported sales were 2.0% higher than the prior-year quarter's $41.3 million.

Source: S&P Capital IQ. Quarterly periods. Dollar amounts in millions. Non-GAAP figures may vary to maintain comparability with estimates.

EPS details
 Last quarter, non-GAAP EPS came in at $0.33. GAAP EPS of $0.23 for Q3 were 12% lower than the prior-year quarter's $0.26 per share.

Source: S&P Capital IQ. Quarterly periods. Non-GAAP figures may vary to maintain comparability with estimates.

Recent performance
 For the preceding quarter, gross margin was 58.0%, 100 basis points better than the prior-year quarter. Operating margin was 16.6%, 200 basis points worse than the prior-year quarter. Net margin was 14.4%, 240 basis points worse than the prior-year quarter.

Looking ahead

The full year's average estimate for revenue is $167.2 million. The average EPS estimate is $1.23.

Investor sentiment
 The stock has a three-star rating (out of five) at Motley Fool CAPS, with 103 members out of 118 rating the stock outperform, and 15 members rating it underperform. Among 35 CAPS All-Star picks (recommendations by the highest-ranked CAPS members), 31 give Volterra Semiconductor a green thumbs-up, and four give it a red thumbs-down.

Of Wall Street recommendations tracked by S&P Capital IQ, the average opinion on Volterra Semiconductor is outperform, with an average price target of $28.00.

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